How to configure a network between 2 dockers containers belonging to 2 different dockers context ?

[gduvalsc]

Hello, I'm using colima on a Mac OS/X M1. I have a docker image "ora23c" which is located in a context using the X86_64 architecture.

I have another docker container which is using the aarch architecture.

$ colima ls
PROFILE STATUS ARCH CPUS MEMORY DISK RUNTIME ADDRESS
default Running x86_64 8 16GiB 60GiB docker
arm Running aarch64 2 2GiB 60GiB docker

The docker container running in "arm" profile is the client, and I want to connect this client to the oracle database running in the "default" profile on the same host.

So I have 2 differents "docker" environnements and I tried to create a network between them.

No solution using a "bridge" network unless I miss something...

I tried too to create an overlay network with "docker swarm init" in one docker and "docker swarm join" in the other docker context. No sucess...

Is there a solution ? Do i miss something ?

Regards.

Gerard

[gduvalsc]

I found a solution but I was constrained to rebuild the "colima" environements.

When creating a colima container, the best advice to give to any user is the specify a "network address".

Exemple:

colima start -c 8 -m 16 -a x86_64 --network-address x86_64
colima start -c 8 -m 16 --network-address aarch64

With this example, colima ls will return the following:

PROFILE STATUS ARCH CPUS MEMORY DISK RUNTIME ADDRESS
aarch64 Running aarch64 8 16GiB 60GiB docker 192.168.106.6
x86_64 Running x86_64 8 16GiB 60GiB docker 192.168.106.5

The important thing is the address 192.168.106.xxx

Without --network-address, there no ip adress and the containers cannot communicate through an IP address

After when you create the "swarn" with docker swarn init, you need to specify the address of the colima container where you init the swarm.

[abiosoft]

What version of Colima are you on? If it is v0.6.x you can check the ip address of each instance with ip addr show eth0.
That ip address is reachable from other docker contexts.

[gduvalsc]

Sorry for the delay to answer, but my colima version is 5.5

Now with the solution I described above, everything is OK. I can now, from a container located in colima x85_64, address a container located in the other colima using the container name.

I wouldn't have had this problem if the --network-address was the default option.

Regards

[NicoMincuzzi]

Hi, I have the same issue. I followed what you described above, creating two different contexts. However it's not clear how I can use a single network for both contexts. It seems that the two containers in the two different contexts not communicate between them. Thanks in advance !

[gduvalsc]

Hello,

Once you have created your 2 colima environements, you need to create a swarm (docker swarm init in one colima context).

With the command "docker swarm join-token manager", you will have the command to run in the other context.

You need to have 2 managers in each context. One is created with "docker swarm init" and the other with "docker swarm join".

When you run docker swarm init, you have an IP address to specify. Use "colima ls", to know which address to specify.

After this, you can create a "network" in one or the other context (docker network create ...). This network will be automatically seen in the other context.

Regards

[NicoMincuzzi]

Hi,
Thanks for your answer. At the moment, I'm using two docker-compose files, one for each context. In the first one, I'm using a docker container which is using the aarch architecture, while the second one contains a docker image, which is located in a context using the X86_64 architecture.
I tried to create in one of docker-compose file a network with driver bridge in order to linked the two contexts, but the containers seem as not communicate between them.

Thanks in advance!

[gduvalsc]

You must use « overlay » for your network and not « bridge » RegardsDe : Nicola Mincuzzi ***@***.***>Date : lundi, 1 janvier 2024 à 10:59À : abiosoft/colima ***@***.***>Cc : gduvalsc ***@***.***>, Author ***@***.***>Objet : Re: [abiosoft/colima] How to configure a network between 2 dockers containers belonging to 2 different dockers context ? (Discussion #941) Hi, Thanks for your answer. At the moment, I'm using two docker-compose files, one for each context. In the first one, I'm using a docker container which is using the aarch architecture, while the second one contains a docker image, which is located in a context using the X86_64 architecture. I tried to create in one of docker-compose file a network with driver bridge in order to linked the two contexts, but the containers seem as not communicate between them. Thanks in advance! —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you authored the thread.Message ID: ***@***.***>

[NicoMincuzzi]

In this particular case, I don't use Swarm and consequently I can't use overlay

[gduvalsc]

I’m afraid that there is no solution if you can’t use Swarm!RegardsGerardDe : Nicola Mincuzzi ***@***.***>Date : mercredi, 10 janvier 2024 à 19:05À : abiosoft/colima ***@***.***>Cc : gduvalsc ***@***.***>, Author ***@***.***>Objet : Re: [abiosoft/colima] How to configure a network between 2 dockers containers belonging to 2 different dockers context ? (Discussion #941) In this particular case, I don't use Swarm and consequently I can't use overlay —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you authored the thread.Message ID: ***@***.***>