☰

我如何知道 docker pull 何时更新图像？

tag-icon • tag-icon bash 18.04 scripts docker
我如何知道 docker pull 何时更新图像？

我有一个脚本，我运行它来更新图像，然后再次stop-> rm->run它们。不幸的是，即使pull没有更新图像（即它已经是最新的），最后 3 个步骤也会发生。我如何更改我的 bash 脚本，以便它仅在 pull 更新图像时运行最后 3 个命令？

#!/usr/bin/env bash
set -e

docker pull linuxserver/sonarr
docker stop sonarr
docker rm sonarr
./run-sonarr.sh

docker pull linuxserver/radarr
docker stop radarr
docker rm radarr
./run-radarr.sh

docker pull linuxserver/nzbget
docker stop nzbget
docker rm nzbget
./run-nzbget.sh

docker pull plexinc/pms-docker
docker stop plex
docker rm plex
./run-plex.sh

答案1

你可以检查字符串“Image is up to date”是否不是展示：

...
export LANG=C
if ! docker pull linuxserver/sonarr | grep "Image is up to date"; then
    docker stop sonarr
    docker rm sonarr
    ./run-sonarr.sh
fi
...

答案2

您可以获取拉取前后的镜像 ID 并进行比较：

docker images --format '{{.ID}}' <your image>

例如：

# ID of current image
~/ >docker images --format '{{.ID}}' tomcat:latest
d636936d0d85

# Pull it (updated this time)
~/ >docker pull tomcat:latest
latest: Pulling from library/tomcat
05d1a5232b46: Pull complete 
5cee356eda6b: Pull complete 
89d3385f0fd3: Pull complete 
65dd87f6620b: Pull complete 
78a183a01190: Pull complete 
1a4499c85f97: Pull complete 
2c9d39b4bfc1: Pull complete 
1b1cec2222c9: Pull complete 
fc95b85a81f3: Pull complete 
0f3868647539: Pull complete 
9b6a6eddb2d9: Pull complete 
8787183cb077: Pull complete 
Digest: sha256:d789f1dc613ef36a24c29f36bdef4891907cd854a5723c73acf6ba78dfc9ac78
Status: Downloaded newer image for tomcat:latest

# ID of new image (different)
~/ >docker images --format '{{.ID}}' tomcat:latest
41a54fe1f79d

# Pull again
~/ >docker pull tomcat:latest
latest: Pulling from library/tomcat
Digest: sha256:d789f1dc613ef36a24c29f36bdef4891907cd854a5723c73acf6ba78dfc9ac78
Status: Image is up to date for tomcat:latest

# Same ID
~/ >docker images --format '{{.ID}}' tomcat:latest
41a54fe1f79d

相关内容