Docker Server Runtime

Internal

• Docker Server Operations

Process

root      1150     1  0 12:06 ?        00:00:00 /usr/bin/dockerd-current --add-runtime docker-runc=/usr/libexec/docker/docker-runc-current --default-runtime=docker-runc --authorization-plugin=rhel-push-plugin --exec-opt native.cgroupdriver=systemd --userland-proxy-path=/usr/libexec/docker/docker-proxy-current --selinux-enabled --log-driver=journald --signature-verification=false --storage-driver devicemapper --storage-opt dm.fs=xfs --storage-opt dm.thinpooldev=/dev/mapper/docker_vg-docker--pool --storage-opt dm.use_deferred_removal=true --add-registry registry.access.redhat.com

root      1174  1150  0 12:06 ?        00:00:00 /usr/bin/docker-containerd-current -l unix:///var/run/docker/libcontainerd/docker-containerd.sock --shim docker-containerd-shim --metrics-interval=0 --start-timeout 2m --state-dir /var/run/docker/libcontainerd/containerd --runtime docker-runc --runtime-args --systemd-cgroup=true

Strorage

/var/lib/docker

How do I know that the space consumed for images and containers is allocated in the thin pool, on the different physical device, and not in /var/lib/docker on the root filesystem.

If Docker is already running, re-initialize Docker:

This will destroy any containers or images currently on the host.

1. systemctl stop docker
2. rm -rf /var/lib/docker/*
3. systemctl restart docker

If there is any content in /var/lib/docker/, it must be deleted. Files will be present if Docker has been used prior to the installation of OpenShift Container Platform.

Then go to https://docs.openshift.com/container-platform/3.5/install_config/install/host_preparation.html#reconfiguring-docker-storage