remove unsupported/unneeded DOCKER_MTU option

Author: sjpb

molecule/README.md

@@ -45,8 +45,6 @@ Then to run tests, e.g.::
     MOLECULE_IMAGE=centos:7 molecule test --all # NB some won't work as require OpenHPC v2.x (-> CentOS 8.x) features - see `.github/workflows/ci.yml`
     MOLECULE_IMAGE=rockylinux:8.6 molecule test --all
 
-**NB:** If the host network has an MTU smaller than 1500 (the docker default), check `molecule.yml` for the relevant test contains `DOCKER_MTU`, then prepend `DOCKER_MTU=<mtu>` to your command. If you have already run molecule you will need to destroy the instances and run `docker network prune` before retrying.
-
 During development you may want to:
 
 - See some debugging information by prepending:

molecule/test12/molecule.yml

@@ -14,10 +14,6 @@ platforms:
     volumes:
       - /sys/fs/cgroup:/sys/fs/cgroup:ro
     network: net1
-    docker_networks:
-      - name: net1
-        driver_options:
-          com.docker.network.driver.mtu: ${DOCKER_MTU:-1500} # 1500 is docker default
   - name: testohpc-compute-0
     image: ${MOLECULE_IMAGE}
     pre_build_image: true

molecule/test14/molecule.yml

@@ -14,10 +14,6 @@ platforms:
     volumes:
       - /sys/fs/cgroup:/sys/fs/cgroup:ro
     network: net1
-    docker_networks:
-      - name: net1
-        driver_options:
-          com.docker.network.driver.mtu: ${DOCKER_MTU:-1500} # 1500 is docker default
   - name: testohpc-compute-0
     image: ${MOLECULE_IMAGE}
     pre_build_image: true
@@ -30,10 +26,6 @@ platforms:
     volumes:
       - /sys/fs/cgroup:/sys/fs/cgroup:ro
     network: net1
-    docker_networks:
-      - name: net1
-        driver_options:
-          com.docker.network.driver.mtu: ${DOCKER_MTU:-1500} # 1500 is docker default
   - name: testohpc-compute-1
     image: ${MOLECULE_IMAGE}
     pre_build_image: true
@@ -46,10 +38,6 @@ platforms:
     volumes:
       - /sys/fs/cgroup:/sys/fs/cgroup:ro
     network: net1
-    docker_networks:
-      - name: net1
-        driver_options:
-          com.docker.network.driver.mtu: ${DOCKER_MTU:-1500} # 1500 is docker default
 provisioner:
   name: ansible
 verifier:

molecule/test5/molecule.yml

@@ -14,10 +14,6 @@ platforms:
     volumes:
       - /sys/fs/cgroup:/sys/fs/cgroup:ro
     network: net1
-    docker_networks:
-      - name: net1
-        driver_options:
-          com.docker.network.driver.mtu: ${DOCKER_MTU:-1500} # 1500 is docker default
   - name: testohpc-compute-0
     image: ${MOLECULE_IMAGE}
     pre_build_image: true
@@ -30,10 +26,6 @@ platforms:
     volumes:
       - /sys/fs/cgroup:/sys/fs/cgroup:ro
     network: net1
-    docker_networks:
-      - name: net1
-        driver_options:
-          com.docker.network.driver.mtu: ${DOCKER_MTU:-1500} # 1500 is docker default
   - name: testohpc-compute-1
     image: ${MOLECULE_IMAGE}
     pre_build_image: true
@@ -46,10 +38,6 @@ platforms:
     volumes:
       - /sys/fs/cgroup:/sys/fs/cgroup:ro
     network: net1
-    docker_networks:
-      - name: net1
-        driver_options:
-          com.docker.network.driver.mtu: ${DOCKER_MTU:-1500} # 1500 is docker default
 provisioner:
   name: ansible
 verifier:

molecule/test6/molecule.yml

@@ -14,10 +14,6 @@ platforms:
     volumes:
       - /sys/fs/cgroup:/sys/fs/cgroup:ro
     network: net1
-    docker_networks:
-      - name: net1
-        driver_options:
-          com.docker.network.driver.mtu: ${DOCKER_MTU:-1500} # 1500 is docker default
 provisioner:
   name: ansible
   inventory: