Jq修改docker-daemon.json开启关闭live-restore

use jq tool to enable or disable docker live-restore feature / aka: use jq tool to edit json file

enable

modify the config file

cat <<< $( jq '. + {"live-restore": true}' /etc/docker/daemon.json ) > /etc/docker/daemon.json

# Format file (If required)
jq <<< $(cat /etc/docker/daemon.json ) > /etc/docker/daemon.json

or in one command line:

jq '. + {"live-restore": true}' <<< $(cat /etc/docker/daemon.json ) > /etc/docker/daemon.json

or in one command line:

jq '. + {"live-restore": true}' /etc/docker/daemon.json | awk '{print > "/etc/docker/daemon.json"}'

tee 也可以实现一条命令结合jq改写json文件，懒得拼装了..

modify and enable the live restore feature

jq '. + {"live-restore": true}' <<< $(cat /etc/docker/daemon.json ) > /etc/docker/daemon.json
systemctl reload docker
docker info | grep -i liv

disable

jq '. + {"live-restore": false}' <<< $(cat /etc/docker/daemon.json ) > /etc/docker/daemon.json
kill -SIGHUP $(pidof dockerd)
docker info | grep Live

Other matters requiring attention

对于挂载了/var/run/docker.sock的容器，需要手动重启 (挂载的是目录的话不会有这个问题)

docker挂载文件的机制是绑定主机上该文件的 inode。

当docker-engine热重启，docker.sock文件的inode值会改变，所以挂载会失效

Workaround

查看该主机上直接挂载 docker.sock 的容器   

docker inspect $(docker ps -q)|grep 'Source.*docker.sock\|Name": "/'|grep sock -B1|grep Name

重启之

more examples

https://gist.github.com/joar/776b7d176196592ed5d8