I would like to know if is it possible to run multiple containers of the same images using different parameters in docker swarm.
In the following example, I have two services ( service_2 and service_3 ) using the same image ( hub/image_2 ). As you can see, I set two different environment variables for each service. When I mount the services ( docker stack deploy --compose-file docker-compose.yml test ) I can see that each service is using the same environment variable (it have value 2 in this case).
version: '3'
services:
service_1:
image: hub/image_1
environment:
- my_env = 1
deploy:
placement:
constraints:
- node.host == host_1
volumes:
- test:C:/test
service_2:
image: hub/image_2
environment:
- my_env = 2
deploy:
placement:
constraints:
- node.host == host_1
volumes:
- test:C:/test
service_3:
image: hub/image_2
environment:
- my_env = 4
deploy:
placement:
constraints:
- node.host == host_1
volumes:
- test:C:/test
volumes:
test:
external:
name: test
The Dockerfile is as follows:
FROM microsoft/dotnet-framework:3.5-windowsservercore
ARG ENTRY
ENV my_env=$ENTRY
WORKDIR C:\\test
ENTRYPOINT C:/test/app.exe %my_env%
This is the service information ( docker service inspect servicename )
Service_2:
[
{
"ID": "uq71dl6ppas4bhbxqj84oxbw2",
"Version": {
"Index": 2430
},
"CreatedAt": "2018-08-27T10:33:15.24867595Z",
"UpdatedAt": "2018-08-27T10:33:15.249951349Z",
"Spec": {
"Name": "test_service_2",
"Labels": {
"com.docker.stack.image": "hub/image_2",
"com.docker.stack.namespace": "test"
},
"TaskTemplate": {
"ContainerSpec": {
"Image": "hub/image_2:latest@sha256:8577cb813fb26aa061e23b5aaec3c9c5089e91edbc52735d61247cf535899527",
"Labels": {
"com.docker.stack.namespace": "test"
},
"Env": [
"my_env = 2"
],
"Privileges": {
"CredentialSpec": null,
"SELinuxContext": null
},
"Mounts": [
{
"Type": "volume",
"Source": "test",
"Target": "C:/test",
"VolumeOptions": {}
}
],
"StopGracePeriod": 10000000000,
"DNSConfig": {},
"Isolation": "default"
},
"Resources": {},
"RestartPolicy": {
"Condition": "any",
"Delay": 5000000000,
"MaxAttempts": 0
},
"Placement": {
"Constraints": [
"node.id == oi3qw4wi00j762c1xixnhc412"
],
"Platforms": [
{
"Architecture": "amd64",
"OS": "windows"
}
]
},
"Networks": [
{
"Target": "9hd78dz1r8u25woejiwu1l9ei",
"Aliases": [
"service_2"
]
}
],
"ForceUpdate": 0,
"Runtime": "container"
},
"Mode": {
"Replicated": {
"Replicas": 1
}
},
"UpdateConfig": {
"Parallelism": 1,
"FailureAction": "pause",
"Monitor": 5000000000,
"MaxFailureRatio": 0,
"Order": "stop-first"
},
"RollbackConfig": {
"Parallelism": 1,
"FailureAction": "pause",
"Monitor": 5000000000,
"MaxFailureRatio": 0,
"Order": "stop-first"
},
"EndpointSpec": {
"Mode": "vip"
}
},
"Endpoint": {
"Spec": {
"Mode": "vip"
},
"VirtualIPs": [
{
"NetworkID": "9hd78dz1r8u25woejiwu1l9ei",
"Addr": "10.0.1.88/24"
}
]
}
}
]
Service_3:
[
{
"ID": "728jj8wqavett7ehejafdxa1p",
"Version": {
"Index": 2414
},
"CreatedAt": "2018-08-27T10:33:07.219679442Z",
"UpdatedAt": "2018-08-27T10:33:07.220656862Z",
"Spec": {
"Name": "test_service_3",
"Labels": {
"com.docker.stack.image": "hub/image_2",
"com.docker.stack.namespace": "test"
},
"TaskTemplate": {
"ContainerSpec": {
"Image": "hub/image_2:latest@sha256:8577cb813fb26aa061e23b5aaec3c9c5089e91edbc52735d61247cf535899527",
"Labels": {
"com.docker.stack.namespace": "test"
},
"Env": [
"my_env = 4"
],
"Privileges": {
"CredentialSpec": null,
"SELinuxContext": null
},
"Mounts": [
{
"Type": "volume",
"Source": "test",
"Target": "C:/test",
"VolumeOptions": {}
}
],
"StopGracePeriod": 10000000000,
"DNSConfig": {},
"Isolation": "default"
},
"Resources": {},
"RestartPolicy": {
"Condition": "any",
"Delay": 5000000000,
"MaxAttempts": 0
},
"Placement": {
"Constraints": [
"node.id == oi3qw4wi00j762c1xixnhc412"
],
"Platforms": [
{
"Architecture": "amd64",
"OS": "windows"
}
]
},
"Networks": [
{
"Target": "9hd78dz1r8u25woejiwu1l9ei",
"Aliases": [
"service_3"
]
}
],
"ForceUpdate": 0,
"Runtime": "container"
},
"Mode": {
"Replicated": {
"Replicas": 1
}
},
"UpdateConfig": {
"Parallelism": 1,
"FailureAction": "pause",
"Monitor": 5000000000,
"MaxFailureRatio": 0,
"Order": "stop-first"
},
"RollbackConfig": {
"Parallelism": 1,
"FailureAction": "pause",
"Monitor": 5000000000,
"MaxFailureRatio": 0,
"Order": "stop-first"
},
"EndpointSpec": {
"Mode": "vip"
}
},
"Endpoint": {
"Spec": {
"Mode": "vip"
},
"VirtualIPs": [
{
"NetworkID": "9hd78dz1r8u25woejiwu1l9ei",
"Addr": "10.0.1.84/24"
}
]
}
}
]
How could I avoid to use different images?