查詢使用某個image的instances
在Docker中，要查詢所有process很簡單，docker ps就會返回所有執行中的列表，也可以加上-a參數來show所有不管關閉或開啟的機器列表... 而如果希望找到由某個image開起來的instances，可以透過filter + ancestor來做到...
docker ps -f ancestor=[image_name]
範例：
docker ps -f ancestor=registry:2
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
54689a3084a4 registry:2 "/bin/registry /etc/d" 6 weeks ago Up 13 hours 0.0.0.0:80->5000/tcp registry
0bcb6beac991 registry:2 "/bin/registry /etc/d" 7 weeks ago Up 13 hours 0.0.0.0:5000->5000/tcp mwciotdemo_registry_1
搭配filter也可以透過label的方式來查詢...
幫啟動的instance加上label...
# docker run -d -l mynginx nginx
Unable to find image 'nginx:latest' locally
latest: Pulling from library/nginx
357ea8c3d80b: Pull complete
0fc04568277e: Pull complete
0bed9719ddcb: Pull complete
Digest: sha256:d33834dd25d330da75dccd8add3ae2c9d7b12302b421b02cecb6cb7b34a1b6
Status: Downloaded newer image for nginx:latest
09386387d9f0681935e01ff058023956cd8c61234344f60e8f4c4aedaaad853
透過filter以label的方式來找尋執行中的個體...
# docker ps -f label=mynginx
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
09386387d9f0 nginx "nginx -g 'daemon off" 17 seconds ago Up 17 seconds 80/tcp, 443/tcp determined_swirles
以上，搭配filter來做查詢可以減少很多處理上的麻煩，推薦大家善用filter唷～