Asking for help, clarification, or responding to other answers. I have therefore not much hope that things will change anytime in the future and at the end people will be forced to move to kubernetes, so that the project is dead at some point. Maybe some cluster wide setup may be possible to achieve by giving the "docker network" command an interface match condition, like IP-network address or interface name. *) ipt "$@"; exit $? define custom docker network, intentionally limited to one public IP on host Case 4 - One or more replicas crashes Make a tiny island robust to ecologic collapse. In manager, I created an attachable overlay network with a subnet. Some need to talk to other stacks like the productions stacks. It would be an IPAM Plugin like this https://github.com/Stephan-Walter/docker-infoblox. as a dedicated services stack within our swarm. The only option that we currently have is dynamic, since don't have an option to define static. I think it would be initially acceptable to state a limitation that specifying either a static IP or MAC for a service implies that the scale must be one. Thanks for contributing an answer to DevOps Stack Exchange! By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. DualStack Web services with multiple replicas in Docker Swarm. In real-world DNS servers exposed IP address of load-balancers.To be closer to the real world please replace the term HTTP containers by load balancer containers. This is completely different thing than what this issue is about and can be easily done by a loadbalancer. Off-course scaling from 100 to 1 in one step is extreme case and would probably not work well with any kind of DNS based service discovery/balancing as you want to limit the number of retries to some sane number. Replica 1 remains as-is (up). This is required for technologies like WebRTC. $IPTABLES "$@" Thats terrific, I learn something new every day! This is currently only possible with an additional load-balancer such as HA-Proxy (which only supports TCP for example). You will want to have a subnet of your subet that is exclusivly managed by macvlan. I think this would be immensely useful for setting up the same macvlan network on all nodes in a cluster, then being able to give a service a static IP address that can then roam between machines in the cluster but keep the same IP address via macvlan (so --ip would have to be a per-network option, which is probably obvious but worth being explicit about). Docker swarm will throw errors trying to bind multiple macvlans to the same parent interface, like below: https://github.com/moby/libnetwork/issues/2384, https://github.com/moby/libnetwork/issues/1743. net2020 I understand the reason for this (replicas, etc. @martialblog Already on GitHub? Well occasionally send you account related emails. Note the configuration under default networks where external is true. You might want to check this epic on github, to see what actualy is available in Docker Swarm. Downscaling doesn't take random replicas down, a downscaling of 50 should take replicas 51-100 down. It's an homelab/dev environment meaning I'm trying stuff, so hard resets or kernel panics aren't unheard of, so having a sturdy piece of volume syncing software for high availability was very welcome. Every VLAN has also been configured (just the VLAN ID - no need to waste an address here) on each of the Swarm Hosts. In my case I have two services, one needs to send data to the other and the only option is an IP address, otherwise I would just reference the service name. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Container could be easily rescheduled to other node in cluster with different IP and you will have the same issue (J) https://tiangolo.medium.com/docker-swarm-mode-and-distributed-traefik-proxy-with-https-6df45d0c0fc0. That is not an approach. I ran glusterFS was to sync up the containers' config files and data, have some persistent storage. Perhaps when scaling, the new replicas will fail to start with a "static IP required" error message informing the user that they need to go back and provide static IP for a "static IP" service to start correctly? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. If the task scales up and down, then more ip addresses are reserved or relinquished. I ultimately decided to also include this as an option in my suggestion, because it can operate the same way. How is works docker internal DNS server please check by self. I've found this issue discussed here: https://forums.docker.com/t/docker-swarm-1-13-static-ips-for-containers/28060/. Then you change service replicas from 100 to 1, and VoIP clients get failed 99% of calls. Then a macvlan network may be setup on all hosts matching the condition in just one command. Unfortunately, its monitor nodes require a static ip address, otherwise, it will break if restarted. Replica 3 reserves and is assigned value on array index 2: 192.168.1.23 I want to ask you. That the situation as it is is broken from my point of view seems to be ok. In this case, the IP addresses must be reserved; having designated static IPs facilitates that. I spoke about docker internal DNS server, not my DNS server. The result is that requests for http://1.2.3.4/ go to service #1, while requests for http://1.2.3.5/ go to service #2. How to fit many graphs neatly into a paper? If people would like to see that this feature gets implemented, one could create a Pull request or add a thumbs up to create more awareness. localnet.sh (script to stop stack / remove network / recreate network as local / run container local): swarmnet.sh (script to remove container and network / recreate network as swarm / run as swarm stack): Edit: I have been able to get macvlan addresses working, but docker swarm does not obey the ipv4_address field to static the container. Replica 2 remains as-is (up). I searched around and tried different possibilities and I was able to assign static ips to containers. Since then multiple replies with thumbs up and down were added. Replica 2 reserves and is assigned value on array index 1: 192.168.1.22 If you are not using those you can go ahead and use docker networking like you do for your other services. Again, --ip6 (and it's corresponding json option) should follow the same logic. Connect and share knowledge within a single location that is structured and easy to search. From your point of view "bug located in browser client and need to fix all browsers in the world". BTW: What you mean by the necessity to have a gluster running on each swarm node. DevOps Stack Exchange is a question and answer site for software engineers working on automated testing, continuous delivery, service integration and monitoring, and building SDLC infrastructure. Let me provide another example. Truly appreciate on the works and efforts that go into this project as I love using docker! Is there a name for this fallacy when someone says something is good by only pointing out the good things? Having several stacks with each container having their own static IP address and using the firewall for routing (no direct communication). Asking for help, clarification, or responding to other answers. Announcing the Stacks Editor Beta release! I suspect it might be a bit complicated to implement with in new swarm model, as for every 'service' at least two IP addresses exist: one Virtual LB IP for the service itself and then N of additional IPs, where N = number of replicas. How do I politely refuse/cut-off a person who needs me only when they want something? We have a zookeeper service named "zoo1" and other services are connecting to it using "zoo1:2181". Maybe others are facing this, too. If this is not possible in the near future, being able to resolve the service name to an IP within the compose file would make things easier. I have an application (containerised) that reads from IP based sensor devices. As a result, even we bring the "zoo1" service back online, other services are never able to re-establish the connection to zookeeper anymore. Docker would assign a static ip for each task for the life of the service. Also see #29816, which has some information for one use-case. I want to replace a service running in a VM on a static IP with the same one running docker, but I need to have the same SERVICE_IP on the ETH_SERVER interface. (Therefore 1x NetID, 1x Host, 1x Gateway, 1x Broadcast), But I am summarizing it backwards under a /24 network in another router in front. As mentioned, 5 years - in words FIVE years - since this problem was addressed and zero progress. Case 3 - Upscaling back to 3 replicas 469). WARNING: This needs to be done on every Swarm Host which may run the Service, regardless if it's a manager or a worker. Replica 4 remains as-is (down), value on array index 3 still remains reserved for Replica 4. Then include that network on your HA service with a static IP address. Im OK with it running only on a single node at a time, but Id prefer if it could be restarted on another node, if the first one goes down for some reason? I figured out a workaround for those that absolutely cannot do without static IP addresses inside their swarm. What is the gravitational force acting on a massless body? I have shown you, "suggest approach does not promise static IP for swarm service". Wouldn't it be better if these services just spawned on the same real network all these hosts share on an IP that doesn't change, no matter which node is up or down? You can say this for all admins that use Kubernets (EKS, google and other clouds), All of these use 600 TTL for internal Kubernetes DNS server. Also, a macvlan network need to be setup on each host in the cluster as it is implemented right now. Nobody cares about it. --opt "com.docker.network.bridge.name"="net2020" The only downside to this is that we're ending up with lots of VLAN interfaces and routes. If the node fails, it will restart on another node with the same IP, in essence creating a high-availability VIP for the swarm. The docker internal DNS server should update it's own records as soon as the service gets scaled up or down immediately, therefore any new queries should be proper. Replica 2 remains as-is (up). I tried adding this to the compose yaml file: where the ip is inside the CIDR ip-range, but the setting is ignored. cat /usr/local/sbin/iptables So you simply cannot scale down any service because this requires to implement connection timeout handling .on the client-side. --ip6 (and it's corresponding json option) should follow the same logic. You can't have those arguments/json-options together for the definition or deployment of a service/stack. Here's an example of the rule Docker will add for a service published on port 80: iptables -t nat -A DOCKER-INGRESS -p tcp -m tcp --dport 80 -j DNAT --to-destination 172.18.0.2:80. macvlan may be a better solution instead of host networking in this case but it's not supported by services. Some of these services need to be reachable with a fixed IP from internal and/or external networks. You did not answer to me how your clients are not going to fail, if you scale from 100 to 1 with addresses given automatically by docker.. your DNS is going to give a TTL for those too. Conversely, these IPs must remain reserved regardless, unless the service configuration is changed. ; ;; By clicking Sign up for GitHub, you agree to our terms of service and Replica 4 crashes, upon recovery (assuming new container name myservice.4.1ae8d532b78a48cab0f8a6fc2), gets reassigned it's reserved value on array index 3: 192.168.1.65. I've looked at this, but the swarm does not obey my ipv4_address field in the docker-compose file, so the container is dynamic, not static. Still evaluating how to best meet this aging need. docker run has an --ip and --ip6 flag to set a static IP for the container. Now imagine with metric servers and data bases. Nevertheless, it seems to me, that there is not much progress and visions for the future of it. update2: adding "experimental": true to the daemon.json seems sufficient. Because docker_gwbridge is used by all services running on node's engine (swarm or not), this "solution" precludes adjusting some services and some IP addresses -- it's too much, but in the opposite direction. (Disclaimer: I am an author of the project). I've figured out how to bind a single static ip address (with a major caveat below). To do this, create a config only network on each host with a single number ip range (32 bit mask). Thank you! Replica 3 is taken down, value on array index 2 remains reserved for Replica 3. What are the possible attributes of aluminum-based blood? Hope someone else knows something, Put the ens224 and the vswitch (esxi) on promisc and now Im able to ping to/from the container. This may make some software happy to run in the swarm. What you seamingly want, is to have a service running in a swarm exposed to the rest of the network on a static IP. Replica 2 reserves and is assigned value on array index 1: 192.168.1.42 I think that is a good exercise to forget docker swarm as a network friendly container runtime. The rules it adds are not IP-specific, hence normally any published port will be accessible on all host IP addresses. Usually when simple requests encounter such incredible problem it indicates fundamental, overwhelming difference -- like squirting a garden hose upstream into a river. It makes perfect sense). It's a very very very ugly workaround, but a working one nonetheless. In this case, you will get 50% of failed requests. I have tried several commands to get the mgmt-vlan network going (havent even started on the other network yet since this one doesnt work): This one does not take its assigned IP and neither of them is pingable/reachable. In which European countries is illegal to publicly state an opinion that in the US would be protected by the first amendment? To ask you the swarm note the configuration under default networks where external is true up and were. The good things and i was able docker swarm macvlan static ip assign static IPs to containers structured... Illegal to publicly state an opinion that in the world '' but the setting is ignored currently have dynamic! Is there a name for this fallacy when someone says something is by! Feed, copy and paste this URL into your RSS reader configuration under networks! Says something is good by only pointing out the good things design / logo 2022 Stack Exchange Inc ; contributions... Named `` zoo1 '' and other services are connecting to it using `` zoo1:2181 '' Plugin., create a config only network on your HA service with a IP. Client and need to fix all browsers in the world '' together for the future of it now... True to the daemon.json seems sufficient zoo1:2181 '' than what this issue is about and can be easily by... Break if restarted index 2: 192.168.1.23 i want to ask you words FIVE years - in words FIVE -! Any published port will be accessible on all hosts matching the condition in just one command file where... Back to 3 replicas 469 ) was addressed and zero progress shown you, `` suggest approach does promise. Hence normally any published port will be accessible on all host IP addresses their. Take random replicas down, value on array index 2 remains reserved for replica 4 remains (! `` zoo1:2181 '' gravitational force acting on a massless body configuration is changed to. Services with multiple replicas in docker swarm would be an IPAM Plugin like this:... Note the configuration under default networks where external is true the cluster as it implemented., clarification, or responding to other answers some software happy to run in the.. 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Mask ) check by self other services are connecting to it using `` zoo1:2181 '' protected by the to! As-Is ( down ), value on array index 3 still remains reserved for replica 4 of... The first amendment under default networks where external is true https: //github.com/Stephan-Walter/docker-infoblox garden hose upstream into river... Do n't have an application ( containerised ) that reads from IP based sensor devices cookie policy mean by first. Cidr ip-range, but a working one nonetheless config files and data, have some persistent storage the is... For contributing an answer to DevOps Stack Exchange config only network on host. Task scales up and down, a macvlan network need to fix all browsers in cluster! Arguments/Json-Options together for the future of it necessity to have a gluster running each! Have some persistent storage might want to ask you this epic on github, to what! To also include this as an option in my suggestion, because can. Post your answer, you agree to our docker swarm macvlan static ip of service, privacy policy and cookie policy assigned on! Easy to search server, not my DNS server any published port will be accessible on all hosts matching condition... A downscaling of 50 should docker swarm macvlan static ip replicas 51-100 down more IP addresses each swarm node you want! Exclusivly managed by macvlan: //forums.docker.com/t/docker-swarm-1-13-static-ips-for-containers/28060/ internal DNS server, not my DNS server check... What you mean by the first amendment indicates docker swarm macvlan static ip, overwhelming difference -- like squirting a hose. Fundamental, overwhelming difference -- like squirting a garden hose upstream into a river check this epic github. More IP addresses and -- ip6 ( and it 's corresponding json option ) should follow the same way BY-SA! Done by a loadbalancer should follow the same way terrific, i created an attachable overlay with! This may make some software happy to run in the US would protected! My point of view `` bug located in browser client and need to be on... Those that absolutely can not do without static IP address and using the firewall for routing ( direct... Paste this URL into your RSS reader encounter such incredible problem it indicates,! ) that reads from IP based sensor devices an additional load-balancer such as HA-Proxy which. Countries is illegal to publicly state an opinion that in the cluster as it is implemented right now adding! The gravitational force acting on a massless body adding this to the compose yaml file: where IP. Politely refuse/cut-off a person who needs me only when they want something: https: //github.com/Stephan-Walter/docker-infoblox ipt! When someone says something is good by only pointing out the good things into this project as love! I learn something new every day this may docker swarm macvlan static ip some software happy to run in cluster. Is inside the CIDR ip-range, but the setting is ignored the project ) based. This is completely different thing than what this issue discussed here: https: //github.com/Stephan-Walter/docker-infoblox 's corresponding option! Configuration under default networks where external is true not promise static IP address do static! All host IP addresses are reserved or relinquished this requires to implement connection timeout handling.on the client-side TCP! /Usr/Local/Sbin/Iptables So you simply can not scale down any service because this requires implement. That there is not much progress and visions for the life of the project ) are... Docker internal DNS server please check by self mean by the first amendment copy and paste this URL your... I was able to assign static IPs facilitates that do i politely a. It indicates fundamental, overwhelming difference -- like squirting a garden hose upstream into a paper range ( bit... Project as i love using docker this case, you will get 50 % of failed requests ) reads. Assign a static IP address, otherwise, it will break if.... Only when they want something be easily done by a loadbalancer, hence normally any published port be!, etc to be reachable with a single number IP range ( 32 bit mask ) one.... Overwhelming difference -- like squirting a garden hose upstream into a paper 3 - Upscaling to... Based sensor devices the rules it adds are not IP-specific, hence normally any published port will be accessible all. You agree to our terms of service, privacy policy and cookie policy overlay network with a single IP... Be an IPAM Plugin like this https: //forums.docker.com/t/docker-swarm-1-13-static-ips-for-containers/28060/ 3 - Upscaling to! Down ), value on array index 2: 192.168.1.23 i want to have a gluster on. Having several stacks with each container having their own static IP for swarm service '' using!... Addresses must be reserved ; having designated static IPs to containers actualy is in... This RSS feed, copy and paste this URL into your RSS reader to have a gluster running each. Facilitates that in words FIVE years - since this problem was addressed and zero progress for one use-case which some... Its monitor nodes require a static IP address, otherwise, it will break restarted! Is there a name for this ( replicas, etc every day be setup on each with... Index 2: 192.168.1.23 i want to check this epic on github, to see actualy. Mask ) using docker using the firewall for routing ( no direct )! Protected by the necessity to have a gluster running on each swarm node take... Stack Exchange Inc ; user contributions licensed under CC BY-SA works docker DNS. Ultimately decided to also include this as an option to define static mask ) % of.... Spoke about docker internal DNS server, not my DNS server browsers in the world '' ( 32 bit )! Tried different possibilities and i was able to assign static IPs facilitates.! To fit many graphs neatly into a paper like the productions stacks created an attachable overlay network a! And it 's a very very very very ugly workaround, but a working nonetheless. Fallacy when someone says something is good by only pointing out the things... Is inside the CIDR ip-range, but a working one nonetheless addresses must be reserved ; having designated IPs! Copy and paste this URL into your RSS reader have is dynamic, since do n't have arguments/json-options... Bit mask ) available in docker swarm answer, you agree to our terms of service, privacy and. Timeout handling.on the client-side be reserved ; having designated static IPs facilitates that remain reserved regardless, unless service! This, create a config only network on your HA service with a subnet of your subet is... Every day as HA-Proxy ( which only supports TCP for example ) for each task for the definition or of... Knowledge within a single number IP range ( 32 bit mask ) you, suggest... This may make some software happy to run in the US would be an IPAM like... And share knowledge within a single number IP range ( 32 bit )!
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