Docker ZFS Storage

Centos Docker Storage Using ZFS

Set Config

1. vim /etc/sysconfig/docker-storage
   DOCKER_STORAGE_OPTIONS='--storage-driver=zfs'

2. vim /etc/sysconfig/docker
   OPTIONS='--graph=/local/docker'

3. mkdir -p /local/docker

4. zfs create -o mountpoint=/local/docker tank/docker

Start And Test ZFS Snapshot

1. systemctl start docker

2. docker pull busybox

3. docker run --name=lmy -it busybox /bin/sh

4. docker ps -l

5. zfs snap -r tank/docker@xxx

6. rm -rf /local/docker

7. zfs rollback -r tank/docker@xxx

8. systemctl restart docker

9. docker start -i lmy

Issues

1. pull 不下来image
   `mkdir -p /etc/systemd/system/docker.service.d/;
   echo "[Service]" > http-proxy.conf;
   echo Environment="HTTP_PROXY=http:<your proxy ip>/" > http-proxy.conf`

2. /etc/sysconfig/docker中--graph参数, 即docker的root目录不能是默认的/var/lib/docker
   否则zfs rollback 之后restart 会失败, 目前还不知道原因.

3. zfs rollback 之后必须先restart docker, 如果直接start container会报错.