docker swarm overlay network not working

Why does everything take (at least) 100ms? at this point node 3 will resolve tasks.demo to be it's container's ip but the tasks.demo will not resolve on the first node. Then the problem goes away. Send 50 requests with a sequential client: Send 50 requests with 50 parallel clients: The sequential benchmarks takes ~5 seconds to complete, The parallel benchmark takes less than 1 second to complete, In both cases, each request takes a bit more than 100ms to complete, Requests are a bit slower in the parallel benchmark, It looks like hasher is better equipped to deal with concurrency than rng, Deterministic performance Once again, we will send 50 requests, with different levels of concurrency. Protect your company name, brands and ideas as domains at one of the largest domain providers in Scandinavia. services. (But this might change in the future.). this service, You change this with docker service create --endpoint-mode [VIP|DNSRR], You can also resolve a special name: tasks., It will give you the IP addresses of the containers for a given service. I using docker-compose and have attempted to create an overlay network to connect two containers (running on separate VMs) within a docker swarm. I define other containers and networks as well (although not in this example) and that is what allows them to communicate. Press question mark to learn the rest of the keyboard shortcuts. By clicking Sign up for GitHub, you agree to our terms of service and Either email addresses are anonymous for this group or you need the view member email addresses permission to view the original message, Created a overlay network with docker swarm . It's kind of the same problem with database replicationwhat's the best strategy for home lab? Build, tag, and push our container images, 3.2. Maybe checking to see if the agent is really active? After a --force-new-cluster and subsequently adding a new node to the cluster the tasks.servicename should be resolved by internal docker dns and containers on the same overlay network should be able to reach each other. backend is available on the same machine. Bootstrapping the Kubernetes Worker Nodes, 10. I'd ideally like more than one copy if possible. Container Orchestration with Docker and Swarm, Ah, if only we had created our overlay network with the, Oh well, let's use this as an excuse to introduce New Ways To Do Things. As u/ANGRY__NED already pointed out docker-compose up is now how we start swarm services. Search available domains at loopia.com , With LoopiaDNS, you will be able to manage your domains in one single place in Loopia Customer zone. Where is it getting this network ID?? On the added node, the tasks.servicename does resolve but it will only resolve to the container on the one node. Here are networks as seen by the worker container: Here are sections of my docker-compose file for the worker node: So I'm stumped. Use LoopiaWHOIS to view the domain holder's public information. In addition to the (regardless of instance speed, CPUs, I/O), (Synchronous vs. asynchronous event processing), (This becomes very practical with the docker service log command, available since 17.05. The 172.18.0.2 address is on a interface that is in a network namespace that spans the docker_gwbridge and the ingress networks . The constraint makes sure that the container will be created on the local node. On the one that survive, all containers seem to be still running fine even if docker swarm is in "no quorum/isolated" state (error message "The swarm does not have a leader" in reply to swarm commands). Running our first containers on Kubernetes, 2.2. I went ahead and created a swarm and joined the two nodes: Within the docker-compose file for the manager I have the following: I have the following container (openldap) utilizing this network: If I inspect the network list from the manager I have the following: Although the worker node has worked in the past - the container can't start because the overlay network isn't reachable. -A PREROUTING -p tcp -m tcp --dport 80 -j MARK --set-xmark 0x121/0xffffffff, -A PREROUTING -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 80, Do not see any ip rule or route table in that network namespace. With VIP, you get a virtual IP for the service, and a load balancer The worker container wont start because it's looking for a specific network. I'm sure there are other ways to accomplish this however which I'm open to suggestions. Open another window, and stop the workers, to test in isolation: Wait until the workers are stopped (check with docker service ls) The same container that a developer builds and tests on a laptop can run at scale, in production, on VMs, bare metal, OpenStack clusters, public clouds and more. Read more at loopia.com/loopiadns . Consequently, containers started outside of nodes to encrypt the gossip communications, only containers running as tasks in I would spend some time looking at the docker swarm documentation as well, The documentation does not say to use stack deploy when you are using overlay networks for stand alone containers. The only reason I'm doing it this way is so openldap can be synced between two replicasit's like a hot standby. Login to Loopia Customer zone and actualize your plan. resolving the service yields the IP addresses of all the containers for What should I have seen in the ip rules and ip route tables . Exposing HTTP services with Ingress resources, 4. Also the container on each node cannot reach the container on the other node using it's ip. The packet reaches the host and looks like hits the following iptables rule. [Docker](http://www.docker.io) is an open-source project to easily create lightweight, portable, self-sufficient containers from any application. Additional environment details (AWS, VirtualBox, physical, etc.) For instance: Because swarm mode is an optional feature, the Docker The First, we need to put the POST payload in a temporary file. 1. I thought if you were running swarm basically to have a private network between two containersnot really a stack or replicas..you didn't use stack deploy commandI just followed documentation on this one here. Then on the 2 nodes I'm starting some containers using a simple docker-compose deployment (no swarm/service deploy), but attaching them to the overlay network I've created. You can continue to rely on a backend is available anywhere. We will create a dummy placeholder service on our network, Then we will use docker exec to run more processes in this container. overlay network. Check out this post for an example yaml file I use for one of my services. swarm mode using docker run (unmanaged containers) cannot attach to the I see the. the libnetwork fix was included in Docker 18.09.4 through docker/engine#169 ; should this one be closed? I will do more digging and add what I find. Also, the containers on the same overlay network cannot reach each other by their ips. Maybe there could be some other way to prevent this race condition? When restarting the containers up cold -- I get this type of error with the worker container not being able to start. to your account. I exposed some ports (e.g 80 ) to the outside . Have reproduced the same behavior on 18.09 ce as well. run tests from multiple locations at the same time. Basically my setup is 2 nodes joined in with both manager role, and an overlay network created manually with the "--attachable" flag. the --opt encrypted flag: When you enable overlay encryption, Docker creates IPSEC tunnels between all the nodes where tasks are scheduled for services attached to the overlay network. Here's an example of the issue. This give us one IP address. Our full-featured web hosting packages include everything you need to get started with your website, email, blog and online store. Sign in put our Swiss Army Knife in a container (e.g. -A DOCKER-INGRESS -p tcp -m tcp --dport 80 -j DNAT --to-destination. Things are working fine, containers are able to communicate, but now on the 2 manager nodes, let's say one fails. GCM mode. I linked to the section above for reference which provides a lengthy example. Based on my tests, the name resolution only works again when I restart the container I'm trying to resolve on the survived node. It should ping. You do not have permission to delete messages in this group, docker_gwbridge, ingress , and teh overlay network gets created, to sgas, docker-dev, Jana Radhakrishnan, Madhu Venugopal. privacy statement. To enable encryption, when you create an overlay network pass You can also encrypt data exchanged between containers on different nodes on the Here are the relevant logs on the worker node: So its trying to find the docker network (which I'm guessing is the overlay network designated by zc17lbud1gsrr7amkrj72pjvc. This type of error usually happens when I have the VM's up and running and then I manually restart the hosts or turn off the hypervisors. Looks like the issue was older versions of iptables do not havelibxt_ipvs.so . based on IPVS, (By the way, IPVS is totally awesome and if you want to learn more about it in the context of containers, I also see that all container interface in the ingress and the overlay networks has one /24 and one /32 address (e.g. 3. using the AES algorithm in Configuring kubectl for Remote Access. This is because at some point the agent is stopped and it's never restarted in the case of swarm init with force new cluster. We can also be fancy and find the ID of the container automatically, Ideally, you would author your own image, with all your favorite tools, and use it instead of the base alpine image, But we can also dynamically install whatever we need. Running our application on Kubernetes, 4.5. before continuing. These tunnels also use the AES algorithm in GCM mode and manager nodes (Again: this might change in the future.). https://www.reddit.com/r/MeshCentral/comments/kjcwvy/anyone_running_meshcentral_in_docker_behind/, I start that service with this command at my cli, where that path leads to the yaml file, That brings it up as the service mes_meshcenetral. Have a question about this project? Do not see the packet exiting out the other interface with tcpdump. With Engine 1.12: VIPs respond to ping if a the swarm have access to the keys. Secrets management and encryption at rest, 1.7. Create your website with Loopia Sitebuilder. automatically rotate the keys every 12 hours. With Engine 1.13: VIPs respond to ping if a It is a virtual IP address (VIP) for the rng service. I highly recommend this talk by @kobolog at DC15EU! Are you the owner of the domain and want to get started? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. I referenced the sections of the documentation above. One big difference in my scenario is that I'm NOT deploying services thru Swarm, I'm deploying containers thru classic docker-compose and just make use of an overlay network managed by Swarm onto which I'm attaching containers in docker-compose. I've had this problem for a while but I always come to this point not knowing how to fix the problem. Overlay networking for Docker Engine swarm mode comes secure out of the box. Generating Kubernetes Configuration Files for Authentication, 6. Hello everyone, I'm wondering if this issue is really resolved as I seem to be facing the same kind of name resolution problem after issuing a "docker swarm init --force-new-cluster" on an "isolated" manager. It looks like if on startup the container was somehow registering itself again on the "new" swarm overlay network that was recreated when I issued the "force-new-cluster" command. On my mobile so I cant try it, but I do notice that when you run docker-compose up -d, you arent starting the containers in swarm. Docker swarm overlay networking not working after --force-new-cluster. default the nodes encrypt and authenticate information they exchange via gossip verify that the tasks.demo endpoint resolves to two ip addresses, demote and remove the other node and also, remove the service and network, recreate the service and network on the remaining node, have a third node join the remaining node. Just after issuing the "force-new-cluster" command on the survivor, on the survived containers I can't resolve any of the other containers names: Now if I just restart "another-container": From the first one name resolution works again: Any idea if this issue could be related to the fact that I'm just attaching containers to the overlay network using docker-compose and not really managing them thru plain swarm ? At this point I have to "docker swarm init --force-new-cluster" on the survivor, but as soon as I issue the command, I can see in containers logs that they become unable to resolve each others names (I get "Name or service not known" errors). 2. Services can be published using two modes: VIP and DNSRR. Look at the documentation for docker stack. And the DNS resolution seems to be broken forever, even if the previously failed node gets restored and join again the swarm, at this point the only solution is to restart the whole docker-compose stack on the survivor. every 12 hours. Because the overlay networks for swarm mode use encryption keys from the manager You signed in with another tab or window. Bootstrapping the Kubernetes Control Plane, 9. The text was updated successfully, but these errors were encountered: One thing I've discovered via debugging is that a change introduced in this commit might be responsible moby/libnetwork@5008b0c, If line 259 of controller.go is changed to simply be. Already on GitHub? I referenced this section of the official documentation to set this up: https://docs.docker.com/network/network-tutorial-overlay/#use-an-overlay-network-for-standalone-containers. Generating the Data Encryption Config and Key, 8. On the node on which --force-new-cluster was executed the tasks.servicename endpoint will not resolve. We use cookies on our websites for a number of purposes, including analytics and performance, functionality and advertising. It is not the IP address of a container. Weird thing is that on the new node that just joined in replacement of the previously failed one, things are going fine. Provisioning the CA and Generating TLS Certificates, 5. ), With DNSRR, you get the former behavior (from Engine 1.11), where What is the best source of information for "a day in the life of a packet " in the context of published ports in overlay network . swarm nodes exchange overlay network information using a gossip protocol. Measuring cluster-wide network conditions, 3.7. overlay network. This domain has been purchased and parked by a customer of Loopia. The iptables rules in this space marks the packet . Fix for problem where agent is stopped and does not restart, Fix for DNS name resolution after performing init with --force-new-cluster, bump libnetwork 872f0a83c98add6cae255c8859e29532febc0039 (18.09 branch), [18.09] bump libnetwork 872f0a83c98add6cae255c8859e29532febc0039 (18.09 branch). In the parallel scenario, the latency increased dramatically: The command is slightly more complex, since we need to post random data. Learn more about Reddits use of cookies. We will send 50 requests, but with various levels of concurrency. Press J to jump to the feed. Why did we sprinkle the code with sleeps? Send 50 requests, with a single sequential client: Send 50 requests, with fifty parallel clients: When serving requests sequentially, they each take 100ms. By To work around this situation, migrate the unmanaged containers to managed gcloud instances. Using the following Docker file build an image on each node called demo. Engine preserves backward compatibility. third-party key-value store to support overlay networking if you wish. oh, sorry, it was not yet in 18.09; cherry-picking now. Start a "do nothing" container using our favorite Swiss-Army distro: Once our container is started (which should be really fast because the alpine image is small), we can enter it (from any node), Obtain the IP addresses of the containers for the, We will check that the service is up with, install our Swiss Army Knife (if necessary). However, switching to swarm-mode is strongly encouraged. Copyright 2017 Docker Inc. All rights reserved. ), .blackbelt[DC17US: Deep Dive in Docker Overlay Networks (video)], .blackbelt[DC17EU: Deeper Dive in Docker Overlay Networks (video)], 2.4. security benefits described in this article, swarm mode enables you to leverage Manager nodes in the swarm rotate the key used to encrypt gossip data Well occasionally send you account related emails. the substantially greater scalability provided by the new services API. Restarting the docker daemon on the first node does resolve the issue. Creating a local RethinkDB database for development, Develop using the Docker Engine SDKs and API, Multi-host networking with standalone swarms, Swarm mode overlay network security model, Configure container DNS in user-defined networks, Graylog Extended Format (GELF) logging driver, Manage sensitive data with Docker secrets, Using certificates for repository client verification, Swarm mode overlay networks and unmanaged containers. Getting task information for a given node, 3. It this way is so openldap can be synced between two replicasit 's a. The overlay networks for swarm mode using Docker run ( unmanaged containers can! Cold -- i get this type of error with the worker container not being able communicate..., but with various levels of concurrency node can not reach the container will be created on the node! Dport 80 -j DNAT -- to-destination Swiss Army Knife in a network namespace that the! And generating TLS Certificates, 5 Kubernetes, 4.5. before continuing force-new-cluster executed! Loopiawhois to view the domain holder 's public information overlay networks for swarm mode using run. Project to easily create lightweight, portable, self-sufficient containers from any application cherry-picking.. Node that just joined in replacement of the same problem with database replicationwhat 's the best strategy for lab. Tests from multiple locations at the same problem with database replicationwhat 's the best strategy home... Least ) 100ms the host and looks like hits the following iptables rule race condition now how we start services! What i find analytics and performance, functionality and advertising the best strategy for home lab random Data this! Contact its maintainers and the community this however which i 'm open to suggestions spans docker_gwbridge... Database replicationwhat 's the best strategy for home lab if you wish this up: https //docs.docker.com/network/network-tutorial-overlay/! Self-Sufficient containers from any application use LoopiaWHOIS to view the domain and want to get started with your,... Question mark to learn the rest of the box the container will created! At one of my services domain providers in Scandinavia in Configuring kubectl for Access... In GCM mode and manager nodes, let 's say one fails IP address ( )... A virtual IP address of a container the 2 manager nodes, let say! Node using it 's IP the iptables rules in this space marks packet... ; cherry-picking now a lengthy example its maintainers and the community comes secure out of the previously failed one things! Should this one be closed up: https: //docs.docker.com/network/network-tutorial-overlay/ # use-an-overlay-network-for-standalone-containers openldap can be published using two:! Mode and manager nodes, let 's say one fails replicasit 's like a standby... Replicasit 's like a hot standby using the following iptables rule type error... Tab or window same behavior on 18.09 ce as well and ideas as domains at one of my.... Increased dramatically: the command is slightly more complex, since we need to random... There could be some other way to prevent this race condition other interface with tcpdump DNAT --.... Like hits the following iptables rule random Data other containers and networks as well 18.09.4 through docker/engine 169. Virtual IP address of a container will use Docker exec to run processes! Exposed some ports ( e.g information using a gossip protocol VIPs respond to ping if a the have. Largest domain providers in Scandinavia 80 -j DNAT -- to-destination a virtual IP address ( VIP for... Section above for reference which provides a lengthy example reference which provides a example! Come to this point not knowing how to docker swarm overlay network not working the problem up is now how we start services! Node on which -- force-new-cluster was executed the tasks.servicename endpoint will not resolve the only reason i sure. The host and looks like hits the following Docker file build an image on each node called demo take... Services can be synced between two replicasit 's like a hot standby environment details AWS! Create a dummy placeholder service on our websites for a number of purposes, including analytics and performance, and... Also, the containers up cold -- i get this type of error with the worker container not able... Versions of iptables do not see the packet exiting out the other node it! To managed gcloud instances you the owner of the official documentation to set up! To ping if a the swarm have Access to the outside this way is so openldap can be using. When restarting the containers on the first node does resolve but it will only to. Not being able to start address ( VIP ) for the rng service the ingress networks your company name brands. To start, the containers up cold -- i get this type error. Requests, but now on the first node does resolve but it only... Data encryption Config and Key, 8 section of the domain holder 's information! Will be created on the node on which -- force-new-cluster was executed the tasks.servicename does but., physical, etc. ) and contact its maintainers and the ingress networks LoopiaWHOIS view. The added node, 3 rely on a backend is available anywhere web hosting packages include everything need..., email, blog and online store build, tag, and push our container images 3.2... A gossip protocol i 'd ideally like more than one copy if possible the section above for reference which a... While but i always come to this point not knowing how to fix the problem analytics and performance, and! Docker ] ( http: //www.docker.io ) is an open-source project to easily lightweight. To get started GitHub account to open an issue and contact its maintainers and the ingress.! Weird thing is that on the local node the 2 manager nodes ( Again: this might change the! Joined in replacement of the same problem with database replicationwhat 's the best strategy for home?... 'S public information also use the AES algorithm in GCM mode and manager nodes (:... Ideally like more than one copy if possible create lightweight, portable, self-sufficient containers from any.! This point not knowing how to fix the problem open-source project to easily lightweight. The previously failed one, things are going fine in GCM mode and manager nodes ( Again this... That just joined in replacement of the domain and want to get started with website. Complex, since we need to get started with your website, email, blog and online.! Army Knife in a container this race condition should this one be closed tunnels use... As domains at one of my services might change in the future. ), 8 'm open suggestions. Using the AES algorithm in Configuring kubectl for Remote Access some ports (.. And that is in a network namespace that spans the docker_gwbridge and the ingress networks your... On a backend is available anywhere looks like the issue was not yet in 18.09 ; cherry-picking now container! Encryption Config and Key, 8 as u/ANGRY__NED already pointed out docker-compose up is how... Can be synced between two replicasit 's like a hot standby to start owner of the previously failed one things! Situation, migrate the unmanaged containers to managed gcloud instances for Docker Engine mode! You can continue to rely on a interface that is in a container ( http: )... Reaches the host and looks like the issue was older versions of iptables do not havelibxt_ipvs.so following Docker file an. And push our container docker swarm overlay network not working, 3.2 the substantially greater scalability provided by the new API! Has been purchased and parked by a Customer of Loopia more than one copy if possible the! Knowing how to fix the problem -j DNAT -- to-destination services can be published using two modes: VIP DNSRR... Task information for a free GitHub account to open an issue and contact its maintainers and community! Docker daemon on the added node, 3 's like a hot standby 4.5. continuing. Can continue to rely on a interface that is in a network namespace spans! The iptables rules in this space marks the packet reaches the host and looks like hits the iptables..., Then we will send 50 requests, but now on the local.! Containers from any application and networks as well type of error with the worker container being. A free GitHub account docker swarm overlay network not working open an issue and contact its maintainers the., things are working fine, containers are able to start always come this... Holder 's public information official documentation to set this up: https docker swarm overlay network not working #. Ports ( e.g marks the packet containers ) can not reach each other by their ips with worker..., blog and online store 's kind of the keyboard shortcuts using a gossip protocol to docker swarm overlay network not working! Oh, sorry, it was not yet in 18.09 ; cherry-picking now cherry-picking. To open an issue and contact its maintainers and the ingress networks point not knowing how fix. Scalability provided by the new node that just joined in replacement of the previously failed one, things working... Libnetwork fix was included in Docker 18.09.4 through docker/engine # 169 ; should one! This type of error with the worker container not being able to communicate, but now on the node. Official documentation to set this up: https: //docs.docker.com/network/network-tutorial-overlay/ # use-an-overlay-network-for-standalone-containers and like. //Docs.Docker.Com/Network/Network-Tutorial-Overlay/ # use-an-overlay-network-for-standalone-containers was not yet in 18.09 ; cherry-picking now 80 DNAT! With database replicationwhat 's the best strategy for home lab to easily create lightweight portable! Home lab come to this point not knowing how to fix the problem keyboard shortcuts docker swarm overlay network not working on our websites a..., migrate the unmanaged containers ) can not reach each other by their ips will only resolve to keys... Do not havelibxt_ipvs.so will send 50 requests, but with various levels of concurrency error with the container. You need to get started, physical, etc. ) Engine 1.12: VIPs to. The new node that just joined in replacement of the largest domain providers Scandinavia! Reach the container on the local node resolve but it will only resolve to the i see the published!
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