You should go and set up your containers using this architecture first. Heres an example for a container using the nginx:latest image: Docker lacks a built-in way to detect image updates and replace your running containers. Advertising:Certain offers on this page may promote our affiliates, which means WunderTech earns a commission of sale if you purchase products or services through some of our links provided. All reviews and suggestions are solely the authors opinion and not of any other entity. I appreciate your help and your tutorials. Are the containers reporting as stopped when you try and recreate them and is only one selected? This is when downtime occurs and the site becomes inaccessible. Your billing info has been updated. Let's see how we can make the process a lot easier!, An independent portal focusing on Linux Command Line, Server, Self-hosting, DevOps and Cloud Learning. What is SSH Agent Forwarding and How Do You Use It? We have a great in-depth tutorial on setting up Nginx reverse proxy to host more than one instances of web services running in containers on the same server. Since portainer is an a container as well, can you describe how to update the portainer container itself? This replaces the long list of flags usually given to docker run. Luckily, applications with 100% uptime requirements are probably already running with multiple instances. Once you have the details, stop this container: The next step is to run a new container with the same parameters you used for running the previous container. While Watchtower is pretty quick at restarting containers, it makes no guarantees about application downtime. Want to know a safer and better approach for this problem? What happens if an image has been renamed (like bitwarden-rs > vaultwarden)? When this process is finished, the container will be recreated with the latest image. Recreation involves removal of the older container and creating a new one in its place with the same settings. Highlight a Row Using Conditional Formatting, How to Add a Word or Phrase to Android's Auto, Hide or Password Protect a Folder in Windows, Access Your Router If You Forget the Password, Access Your Linux Partitions From Windows, How to Connect to Localhost Within a Docker Container. You might wonder why not use the latest tag anyway instead of specifying the version number manually? Move into the application directory and edit the docker-compose file with a command line text editor. This is explained in greater detail in the video above. 3. Read more Docker containers are meant to be disposable and easily replaced. Im following your youtube channel. There are many different ways to update Docker containers, but Portainer makes the process somewhat straightforward. Check here for details. I am not positive of this (I will try and do some testing at some point), but thats how I remember it working. This method basically consists of these steps: List the docker images and get the docker image that has an update. When you purchase through our links we may earn a commission. Check your email for magic link to sign-in. I believe you know what those parameters are because you had created them in the first place. Also, I wonder if you could show us how we can pull a Docker image from Docker Hub using Portainer, and create a stack on portainer. This will ensure that everything is updated and your data stays the same. I'll show the steps of this method first, followed by a real life example. While this can be a very resourceful method to update your containers to the latest versions of the apps they run, do note that you can use the same method to also make any configuration changes or modify environmental settings without facing downtime issues. If an old container was using this image, a pull and replace process would trigger a major version bump for the Node binary inside the container. James Walker is a contributor to How-To Geek DevOps. Our first implementation was a collection of shell scripts that looked at the Hub for new images, pulled them down and restarted the running containers. How to Set Up OpenMediaVault on a Raspberry Pi, https://www.wundertech.net/how-to-self-host-bitwarden-on-a-raspberry-pi/. Please try again. All Rights Reserved. If you have an application that is sensitive to downtime, you'll want to be careful how you use Watchtower. Back in May of this year, we launched ImageLayers which was the first hosted application released by our team. Stopping containers and ..RECREATE option is MISSING ! He has experience managing complete end-to-end web development workflows, using technologies including Linux, GitLab, Docker, and Kubernetes. 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Check your domain name and you will find it still accessible at blog.domain.com. Watchtower will automatically detect new image releases on Docker Hub, pull them to your machine, and replace containers using the image. Before you move to step 2 described above, it is advisable to observe your application's behavior on your browser (both as a page refresh after login or as a fresh page access on a private, cache-free browser window) after doing step 1. docker pull portainer/portainer-ce How to Use Nginx Reverse Proxy With Multiple Docker Apps. The result is a convoluted manual replacement process. This can be crucial if you must troubleshoot an issue or perform a change that you may deem necessary in a live container, but do not want to bring it down while doing so. Thanks so much! Not there for transmission, yacht, ghost. Copyright 2022 - WunderTech is a Trade Name of WunderTech, LLC -, 2. I apologize as I know this isnt the best help! The stack is started with docker-compose up, using the configuration contained in the file. Conclusion Portainer Update Docker Container. Kudus!! As far as I know, the option should be there. Here, web-app has been set as the service name for the web application. You can update the containers without impacting the running services (for most web services). By submitting your email, you agree to the Terms of Use and Privacy Policy. The example shown here is what we use to update our Ghost instance running this website. Mount the config file into your Watchtower container to enable access to your registry: Docker lacks any mechanism to detect and apply upstream image updates to your running containers. Let me show you both ways one by one. The --scale flag is used to create additional containers as specified. I am just recently getting started with Docker and Portainer on my synology NAS and I find all your tutorials incredibly helpful and very well documented. Docker Compose names its containers as directory-name_service-name_1. For the final step, you scale down to the single container setup once again: [emailprotected]:~/web-app$ docker-compose up -d --scale web-app=1 --no-recreate. While we do our best to provide accurate, useful information, we make no guarantee that our readers will achieve the same level of success. Trust me, this is worth the trouble. Watchtower will pull down your new image, gracefully shut down your existing container, and restart it. We use different image tags for the different environments so the images destined for our QA server are tagged with "qa" while anything tagged with "latest" goes to production. If you were looking for a straightforward solution, sorry to disappoint you but it's not going to be one because here you'll have to deploy your containers in a reverse-proxy architecture with Docker Compose. 5. Do you see the problem with this approach? If you want to be using the latest version of software inside the container, pay attention to the image authors tagging practices. Let's Encrypt server takes care of SSL deployment for all services, all containers. This is what makes Docker containers so easy to work with! However, with a hosted application, we needed the extra step of starting the container on one or more of our servers. Today, we're going to present another approach to deployment that we call Watchtower. Our initial pass at this had our CircleCI job SSH'ing into our servers and executing docker commands to pull images and stop/start containers. Depending on your circumstances, you might not feel a need to upgrade containers in this way at all. Watchtower itself is deployed as a container: Now youve got a functioning Watchtower install. Opening a public-facing port isn't the end of the world but, due to the security implications, is something we'd rather avoid if possible. Even though you specify scaling up to 2 containers, --no-recreate ensures that only one is added since you already have your old container running. On WordPress: Ensure that you add define( 'AUTOMATIC_UPDATER_DISABLED', true ); as a bottom line on the file wp-config.php located at /var/www/html and mount /var/www/html/wp-content instead of /var/www/html as volume. Except Nextcloud switching to maintenance mode for a few seconds, the procedure works extremely well for the other three. This will result in a downtime for the running service. This is something that's become more important to us as we've moved from just creating images for other people to actually running containerized applications in production. In this case, make sure youre using the --pull flag with docker build so upstream fixes are included in your images. You have to stop the running container and then create a new one. He is the founder of Heron Web, a UK-based digital agency providing bespoke software development services to SMEs. This is the crucial part where we avoid downtime: Note that the older container's name is ghost_ghost-blog_1. What's the Difference Between GPT and MBR, Take Screenshot by Tapping Back of iPhone, Pair Two Sets of AirPods With the Same iPhone, Download Files Using Safari on Your iPhone, Turn Your Computer Into a DLNA Media Server, Download and Install Older Versions of macOS. Time to update it to the latest version 3.37.1! After step 3, the WordPress admin panel would show that your WordPress is up-to-date and will ask you to proceed and update your database. Whenever a commit is pushed to the master branch of our GitHub repo a webhook triggers a CircleCI job which is responsible for running tests, compiling code (where appropriate), and building a Docker image. You can automate the process of checking for updated image tags and restarting your containers using third-party projects. Currently, Im running an old version (2.3.1) and we will be updating that to the latest version. Suppose you are running a service in a container and there is a new version of the service available through their docker image. I love Portainer (use it for all other Docker instances on other OSs), but I find it a little confusing on Synologys. Most of our servers sit on a private network behind a load balancer and don't require any sort of direct, incoming connection from the public internet. How to Manage an SSH Config File in Windows and Linux, How to Run GUI Applications in a Docker Container, How to Use Cron With Your Docker Containers, How to Check If Your Server Is Vulnerable to the log4j Java Exploit (Log4Shell). Watchtower will take care to ensure that any flags/arguments that were used when a container was deployed initially are maintained across restarts. Success! We have ourselves faced this when we found that log rotation wasn't enabled in one of our live containers. Learn to easily start a blog using Ghost and secure it using Traefik on a Docker container., Here's a complete step by step guide to set up SSL certificate monitoring with open source tool Checkmk., Helm has a lot of awesome tools around it, but chart storage has always been an issue. Once you remove it with step 3, this warning would no longer exist. Updating a docker container is not an issue but updating docker container without downtime is challenging. In case you are already using a service by using custom named containers in your docker compose file, to use this method, simply comment out the line (with a # prefix) that includescontainer_name inside the service definition. Whereas Zodiac uses a push-based deployment model (a user pushes an application to a remote system), Watchtower enables pull-based deployments. Keep in mind that you can always recreate an existing container using an older version if you run into any unexpected problems. First, Watchtower doesn't make any attempt to address the first-run issue. Unfortunately, you will have to recreate the container. After step 2, give it around 15-20 seconds for the new changes to take into effect and then remove the old container: On different web apps, the reflected changes are behaviorally different after you run the above command(discussed as a bonus tip at the very bottom of this tutorial). Control All Your Smart Home Devices in One App. You can leave the old container there as a backup until you verify the new container is working. Ghost is a CMS and we use it for Linux Handbook. Sometimes it can be tempting to manually update software inside your containers. If you are looking to manage critical services using docker containers, the reverse proxy method will help you a great deal in the long run. Docker Compose lets you create declarative representations of container stacks using a docker-compose.yml file. Check your inbox and click the link. When you use the following command, a new container is created based on the new changes made in the docker compose file. This is because your old container is still running. Running apt-get update && apt get upgrade -y on a schedule (or your package managers counterparts) is standard practice when administering a bare metal Linux server. One crucial part that I am sadly lacking is, how do I (correctly) install an image via portainer in the first place, especially where do I do the mapping between the synology folders and the mounted ones in the container? On Rocket.Chat: It can take around 15-20 seconds for the Admin>Info page to show that you are running the latest version even before you do step 3. If you specified a -p 80:8080 port mapping when you started your container, Watchtower will use that same configuration any time it restarts it. If you like what we do here to educate Linux, you can support us with your donation. Make sure you give it some time before accessing your Nextcloud URL as it could show a 502 bad gateway error until your Nginx container sees the newly scaled Nextcloud container based on the latest version. Say, I have an existing configuration based on an older version located at /home/avimanyu/ghost: Note that the above docker compose configuration is based on a pre-existing Nginx docker configuration described here, running on a network named net. Additionally, Watchtower knows how to properly restart a set of linked containers. James Walker is a contributor to How-To Geek DevOps. That is correct! So, I revise it in the image section as: Now to put the scaling method to good use: With the above command, the older container remains unaffected but a new one joins in with the same configuration but based on the latest version of Ghost: Had I used the conventional approach with docker-compose up -d instead, I would not have been able to avoid the recreation of the existing container to be based on the latest image of Ghost. I have tested this method with Ghost, WordPress, Rocket.Chat and Nextcloud instances. We had published a number of Docker images prior to that, but this was the first one that we were going to run on a public-facing server. Container environments arent meant to be modified after an instance is created; filesystem changes should be limited to writes to temporary paths and dedicated Docker volumes which outlive the container. You can forget specific image names and tags, instead trusting Compose to pull changed base images, rebuild your layers atop them, and then recreate your containers. Once the image was built, our CircleCI job would then push the image to the Docker Hub. To keep downtime at a minimum to a zero across different applications, make sure you provide sufficient time to the newly scaled and up-to-date containers so that the Nginx containers can finally acknowledge them before you remove the old ones in step 2. It can be simplified by using Docker Compose to start your containers instead of the plain docker run command. Using latest 2.6.2 portainer. Docker Compose has a built-in pull command that will pull updated versions of all the images in your stack. Confused? This worked but we realized that we were opening a port on our server just for our CI/CD process. I dont think it happens that frequently, but in this case, I would recreate the container using the existing volumes and everything should function the exact way it always has. Heres how to manage image updates across your container fleet. At this time of writing, this is an older version of Ghost. the best way to update the portainer container is to use the following from the command line (assuming youve installed it at default paths) : docker stop portainer Keep up the good work! There are a few important Watchtower limitations that should be noted. Watchtower will monitor running containers and ensure that they stay up-to-date, but getting those containers running in the first place is outside of its scope. These commands arent normally run within a Docker container, although they may be included as part of a Dockerfile to get the very latest security patches during an image build. The status will change to running. After creating the new container for the above using step 1 as described in this tutorial, for step 2, the old container(that wasn't stopped to avoid downtime) name would be as it was specified earlier using container_name(also can be checked with `docker ps` before removing the old container). As an Amazon associate, we earn from qualifying purchases. In the future, we may add a feature to Watchtower which would allow it to boot-strap your application, but even then you're still gonna need a way to start Watchtower itself. Hello, On Nextcloud: After step 2, Nextcloud would switch to maintenance mode for a few seconds and then load your files again. After you make your changes and are sure that the issue is fixed, you can bring down the older one with ease. Pulling node:latest will deliver the most recent Node.js version, currently 16. Sorry, something went wrong. Last month, we launched a new tool named Zodiac which is used to deploy (and rollback) Docker apps. It is probably a total beginner question for you, but maybe it is worth it to do a tutorial on it. WordPress and SQL would be great. Next generate a credentials string from your registry username and password: Paste the resulting Base64-encoded string into the config file, replacing the credentials placeholder text. As I stated above, this is not the only way of doing this. Create a JSON file with the following content: Replace example.com with the path to your registry. Get the latest changes to this image using docker pull command: Now get the container ID or name of the container that is running the older docker image. We did the necessary changes to enable it and at the same time avoided any downtime while doing so with this method. Maybe I am not the only one with this problem. With Watchtower you can update the running version of your containerized app simply by pushing a new image to the Docker Hub or your own image registry. So now I have two containers running based on the same ghost configuration. The best way to update it is to delete the container (while keeping all of the volume information), and then recreating it with the same volumes. Docker Compose will handle this for you and select the tags specified in your docker-compose.yml. As an example, pulling a new version of node:14 will get you the latest patch release of Node.js 14. Thank you! I wonder if you can provide us with an app template that works with Portainer on a Raspberry pi (arm based). Under Administration > Overview > Security & setup warnings, you might get a warning like, "Your web server is not properly set up to resolve "./well-known/carddav". Without this flag, Docker would reuse the existing tag reference if the image was already present on the system. Note that the previous container is still up and running. Really confused with how to update containers via portainer. I will also look into developing an app template one day! If the data is not mapped to a local folder, it will be overwritten with the latest image data. So, I am not going to discuss it here again. Here are a few tips and things to keep in mind while following this method. First of all, you need to edit the existing docker compose file with the version number of the latest image. The initial start-up of your application will need to be handled by something like Docker Compose, Zodiac or plain ol' docker run. I feel like its fairly infrequent, but I suspect that there was a request from Bitwarden to rename the container for clarity purposes (since its not created by the bitwarden developers). Can I Use iCloud Drive for Time Machine Backups? Please view our complete disclaimer at the bottom of this page for more information. In this tutorial, I have designed a step by step methodology that can be very helpful in your day to day DevOps activities. Get the latest insights directly to your inbox! This should be avoided as it goes again Dockers principles. By selecting this button, the container will take the persistent data and recreate the container. Pulling the new version of a tag is not necessarily the same as using the most recent release of an image. Today we are going to look at how to update a Docker container using Portainer. Watchtower is an application that will monitor your running Docker containers and watch for changes to the images that those containers were originally started from. Watchtower was born! How to Install Portainer on a Raspberry Pi! Images which youre building yourself need to be rebuilt when their base image changes. You've successfully subscribed to Linux Handbook. This is why you should use the --no-recreate flag while scaling up. When a new version of a containers base image is released, you should pull the new image and start a new container instance. What Is a PEM File and How Do You Use It? As part of our previous image creation efforts we had already developed a continuous integration process that was working well for us. Since the old container needs to be stopped before the new one can be started there will be some (hopefully small) period of time where the container isn't running at all. This approach worked well enough for us that we decided to turn our shell scripts into a general-purpose service that could be used by anyone. Watchtower only works with Docker Hub by default. 2022 LifeSavvy Media. The same flags you gave to docker run will be supplied to the replacement containers. Select the container and Start it. In such a case you would like to update the Docker container. Please join the discussion and share your thoughts, feedbacks or suggestions in the comments section below. Success! US CHIPS Act: What Is It, and Will It Make Devices Cheaper? 2. So far weve seen how to handle containers started from images youre pulling directly from Docker Hub or another registry. He is the founder of Heron Web, a UK-based digital agency providing bespoke software development services to SMEs. Thats one of the main reasons I havent created a tutorial on Portainer. There are various ways, but this is what I consider to be the easiest. Now we have Watchtower running on each of our QA and production servers and our apps are automatically updated anytime a new image is pushed to the Docker Hub. For many of our use cases one second of downtime during a deployment is no big deal, however, we recognize that there are plenty of applications which may have stricter requirements. You can use it with private image registries by supplying credentials in a configuration file. If you have any questions, feel free to leave them in the comments! Downtime does have a huge impact at both individual and commercial level and this is why covering this topic was an absolute necessity. Its good to periodically check and ensure that your containers are running the latest version. Please take Watchtower for a spin and let us know if you find it useful. How to Monitor SSL/TLS Certificates with Checkmk, How to Store Helm Charts in Azure Container Registry, Stop and remove the container running the old docker image, Create a new container with the newly pulled docker image. Finally, scale down the configuration to its original setting: As mentioned earlier, after removing old containers, the changes are reflected in the respective web apps, but they obviously behave differently due to diverse app designs. You can avoid this conflict by leaving that task of container naming to Docker Compose (done automatically as per its naming convention). Use the docker ps command for this purpose. Example, pulling a new version of a containers base image is released, you can automate process... Time to update it to the image the version number manually recreation involves removal of the service available their. Look at how to update containers via Portainer your new image, gracefully shut down your container! An Amazon associate, we earn from qualifying purchases docker container apologize as I,. Managing complete end-to-end web development workflows, using the image to the latest tag anyway instead of the name! Will ensure that your containers using the configuration contained in the video above the containers without the. To recreate the container will be recreated with the path to your machine, and Kubernetes be! Zodiac which is used to create additional containers as specified update docker container docker Compose done. But we realized that we were opening a port on our server just our! You run into any unexpected problems handled by something like docker Compose file currently 16 create declarative of! Far weve seen how to update docker container it to the latest version update docker containers are running the tag... Tag reference if the data is not an issue but updating docker container without downtime is challenging as I above... View our complete disclaimer at the bottom of this page for more information join the discussion share! Here again providing bespoke software development services to SMEs a functioning Watchtower install of Heron web a. Helpful in your stack Watchtower for a spin and let us know you... Me show you both ways one by one a configuration file: the... And we use to update a docker container recent Node.js version, 16! As it goes again Dockers principles select the tags specified in your images on it will pull versions. This case, make sure youre using the -- scale flag is used to create additional containers as specified issue. Server takes care of SSL deployment for all services, all containers are solely the authors opinion and not any..., pull them to your registry you gave to docker run maybe am... Container was deployed initially are maintained across restarts downtime does have a huge impact at both individual and commercial and. Be rebuilt when their base image is released, you agree to the docker images and get the image... That log rotation was n't enabled in one of the older container and creating new. How Do you use Watchtower select the tags specified in your update docker container to day DevOps activities of,. Private image registries by supplying credentials in a container was deployed initially are maintained restarts... Container itself: Now youve got a functioning Watchtower install, LLC -,.. After you make your changes and are sure that the previous container is not necessarily same! And there is a new container is created based on the new container is working the of... A tag is not an issue but updating docker container using an older version the. Docker containers are meant to be careful how you use the -- pull flag docker... Of Ghost it will be updating that to the latest version and executing docker commands to pull images and the., applications with 100 % uptime requirements are probably already running with instances... Web-App has been set as the service name for the other three important Watchtower limitations that should noted... Reference if the data is not the only way of doing this mind that can. You describe how to manage image updates across your container fleet best help again... And are sure that the previous container is not mapped to a local folder, it be! Is working name of WunderTech, LLC -, 2 to manually update software inside your containers using latest! Should pull the new version of Ghost the process of checking for updated image tags and restarting your.. Downtime is challenging directly from docker Hub youve got a functioning Watchtower install checking for updated image tags and your! Things to keep in mind while following this method better approach for this problem DevOps activities services ) the file. Walker is a CMS and we will be supplied to the docker Hub or registry! Until you verify the new changes made in the comments the -- pull flag with docker build so upstream are... End-To-End web development workflows, using technologies including Linux, GitLab, docker, and restart it leave! To update the docker images and stop/start containers maybe I am not going to present another approach to deployment we... We had already developed a continuous integration process that was working well for us we 're going to it. Let us know if you like what we Do here to educate Linux, you should the! Handle containers started from images youre pulling directly from docker Hub restart a of. Docker-Compose file with the following command, a UK-based digital agency providing software! Manually update software inside your containers such a case you would like to update docker update docker container, will! A built-in pull command that will pull down your new image and start a new tool Zodiac! Container, pay attention to the Terms of use and Privacy Policy running. Are included in your images an application that is sensitive to downtime, you can leave the container... Did the necessary changes to enable it and at the same flags you gave to docker Compose a. Your new image and start a new one in its place with the version of. Your container fleet join the discussion and share your thoughts, feedbacks or suggestions in the docker image total question... Private image registries by supplying credentials in a container: Now youve got a Watchtower! Containers as specified recreate an existing container, and will it make Devices Cheaper for services... Mapped to a local folder, it will be updating that to the latest version!! You try and recreate the container, and Kubernetes which is used to create containers! We 're going to look at how to handle containers started from images youre pulling directly from Hub... Command, a new one those parameters are because you had created them in the file docker that... Of doing this updating that to the docker Compose has a built-in pull command that will pull down your image!, applications with 100 % uptime requirements are probably already running with multiple instances feel. It with private image registries by supplying credentials in a configuration file a! As well, can you describe how to properly restart a set of linked containers recreated with the same.. Know a safer and better approach for this problem process is finished, the option should there. Works with Portainer on a Raspberry Pi, https: //www.wundertech.net/how-to-self-host-bitwarden-on-a-raspberry-pi/ would then the... Nextcloud instances deployment for all services, all containers applications with 100 % uptime requirements probably. So easy to work with where we avoid downtime: Note that the previous container is still.! But Portainer makes the process of checking for updated image tags and restarting your containers has experience managing end-to-end. Removal of the latest version 3.37.1 contributor to How-To Geek DevOps: latest will deliver most. Docker-Compose.Yml file still accessible at blog.domain.com Watchtower is pretty quick at restarting containers, makes! Released, you 'll want to be rebuilt when their base image changes our server for... Had our CircleCI job SSH'ing into our servers and executing docker commands to pull images get! You 'll want to be careful how you use it with private image registries by supplying credentials a! Checking for updated image tags update docker container restarting your containers using third-party projects Hub. Data and recreate the container present another approach to deployment that we call Watchtower your images is ghost_ghost-blog_1 what. Can avoid this conflict by leaving that task of container stacks using docker-compose.yml... Example, pulling a new container is still up and running and Privacy Policy in. Seen how to update containers via Portainer inside your containers leaving that task container! Was deployed initially are maintained across restarts discussion and share your thoughts feedbacks... Above, this is what I consider to be using the image was present..., Im running an old version ( 2.3.1 ) and we use it with private registries. Above, this is what we use to update docker containers, but this is explained in greater in! Basically consists of these steps: list the docker container as well, can describe... Push-Based deployment model ( a user pushes an application that is sensitive downtime... Impacting the running services ( for most web services ) Portainer container itself using this architecture.! Recreate the container on one or more of our live containers template one day are probably already running multiple. And your data stays the same from qualifying purchases you try and recreate the,... Your machine, and replace containers using third-party projects is updated and your stays! Of all, you need to upgrade containers in this way at all is only selected... That task of container naming to docker Compose has a built-in pull command that will pull down your image! An old version ( 2.3.1 ) and we use it ( a user pushes an to! Finished, the option should be noted topic was an absolute necessity at this time of writing, this would! Got a functioning Watchtower install comments section below I wonder if you find it.! Main reasons I havent created a tutorial on Portainer web-app has been renamed ( like bitwarden-rs > ). Docker images and get the docker image we needed the extra step of starting the container will be with. A Trade name of WunderTech, LLC -, 2 really confused with to! What those parameters are because you had created update docker container in the comments section..
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