Docker Server Runtime: Difference between revisions

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=Configuration=
=Configuration=


=Strorage=
/etc/docker
 
/etc/sysconfig/docker-storage
 
=Storage=


/var/lib/docker
/var/lib/docker


<font color=red>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.
<font color=red>


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:
Verify after a while that stuff is stored in external storage.
</font>


This will destroy any containers or images currently on the host.
=Logging=
# systemctl stop docker
# rm -rf /var/lib/docker/*
# 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
Container logs: /var/lib/docker/containers/<hash>/<hash>-json.log
</font>

Latest revision as of 02:29, 30 June 2017

Internal

Process

OpenShift Docker

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

Configuration

/etc/docker

/etc/sysconfig/docker-storage

Storage

/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.

Verify after a while that stuff is stored in external storage.

Logging

Container logs: /var/lib/docker/containers/<hash>/<hash>-json.log

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