On self-hosted runner, pipeline steps fail to start reporting the following:
time="2022-04-16T21:51:36.074513821Z" level=warning msg="could not change group /var/run/docker.sock to docker: group docker not found"
time="2022-04-16T21:51:36.074957119Z" level=warning msg="Binding to IP address without --tlsverify is insecure and gives root access on this machine to everyone who has access to your network." host="tcp://0.0.0.0:2375"
time="2022-04-16T21:51:36.074980513Z" level=warning msg="Binding to an IP address, even on localhost, can also give access to scripts run in a browser. Be safe out there!" host="tcp://0.0.0.0:2375"
time="2022-04-16T21:51:37.075347836Z" level=warning msg="Binding to an IP address without --tlsverify is deprecated. Startup is intentionally being slowed down to show this message" host="tcp://0.0.0.0:2375"
time="2022-04-16T21:51:37.075485146Z" level=warning msg="Please consider generating tls certificates with client validation to prevent exposing unauthenticated root access to your network" host="tcp://0.0.0.0:2375"
time="2022-04-16T21:51:37.075501936Z" level=warning msg="You can override this by explicitly specifying '--tls=false' or '--tlsverify=false'" host="tcp://0.0.0.0:2375"
time="2022-04-16T21:51:37.075526046Z" level=warning msg="Support for listening on TCP without authentication or explicit intent to run without authentication will be removed in the next release" host="tcp://0.0.0.0:2375"
time="2022-04-16T21:51:52.184158579Z" level=warning msg="failed to load plugin io.containerd.snapshotter.v1.devmapper" error="devmapper not configured"
time="2022-04-16T21:51:52.185239911Z" level=warning msg="could not use snapshotter devmapper in metadata plugin" error="devmapper not configured"
time="2022-04-16T21:51:52.193368196Z" level=warning msg="failed to load plugin io.containerd.internal.v1.opt" error="mkdir /opt/containerd: read-only file system"
time="2022-04-16T21:51:52.290152805Z" level=warning msg="Your kernel does not support cgroup blkio weight"
time="2022-04-16T21:51:52.290199485Z" level=warning msg="Your kernel does not support cgroup blkio weight_device"
time="2022-04-16T21:51:52.309341368Z" level=warning msg="Running modprobe bridge br_netfilter failed with message: ip: can't find device 'bridge'\nbridge 200704 1 br_netfilter\nstp 16384 1 bridge\nllc 16384 2 bridge,stp\nip: can't find device 'br_netfilter'\nbr_netfilter 24576 0 \nbridge 200704 1 br_netfilter\nmodprobe: can't change directory to '/lib/modules': No such file or directory\n, error: exit status 1"
time="2022-04-16T21:51:52.312787457Z" level=warning msg="Running iptables --wait -t nat -L -n failed with message: `modprobe: can't change directory to '/lib/modules': No such file or directory\niptables v1.8.6 (legacy): can't initialize iptables table `nat': Table does not exist (do you need to insmod?)\nPerhaps iptables or your kernel needs to be upgraded.`, error: exit status 3"
failed to start daemon: Error initializing network controller: error obtaining controller instance: failed to create NAT chain DOCKER: iptables failed: iptables -t nat -N DOCKER: modprobe: can't change directory to '/lib/modules': No such file or directory
iptables v1.8.6 (legacy): can't initialize iptables table `nat': Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
(exit status 3)
The OS of the Docker host of the self-hosted runner is "AlmaLinux release 8.5 (Arctic Sphynx)"
I fear this relates to the docker-in-docker run for self-hosted runners.
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