ctr打tag
问题
以前使用docker习惯了，突然发现crictl是无法打tag的
需求
一个阿里云镜像 registry.aliyuncs.com/k8sxio/pause:3.6 ，用 crictl 命令下载后，需要改成registry.k8s.io/pause:3.6 供k8s集群使用
原因
- 语法
crictl 没有tag选项，只能用ctr命令打tag
解决
先上答案
ctr -n k8s.io i tag registry.aliyuncs.com/k8sxio/pause:3.6 registry.k8s.io/pause:3.6
下载镜像
[root@k3s-test ~]# crictl pull registry.aliyuncs.com/k8sxio/pause:3.6
当然也可以用ctr命令下载
[root@k3s-test ~]# ctr images pull registry.aliyuncs.com/k8sxio/pause:3.6
查看下载结果
[root@k3s-test ~]# crictl images
IMAGE TAG IMAGE ID SIZE
docker.io/rancher/klipper-helm v0.7.3-build20220613 38b3b9ad736af 239MB
docker.io/rancher/klipper-lb v0.3.5 dbd43b6716a08 8.51MB
docker.io/rancher/local-path-provisioner v0.0.21 fb9b574e03c34 35.3MB
docker.io/rancher/mirrored-coredns-coredns 1.9.1 99376d8f35e0a 49.7MB
docker.io/rancher/mirrored-library-busybox 1.34.1 7a80323521ccd 1.47MB
docker.io/rancher/mirrored-library-traefik 2.6.2 72463d8000a35 103MB
docker.io/rancher/mirrored-metrics-server v0.5.2 f73640fb50619 65.7MB
docker.io/rancher/mirrored-pause 3.6 6270bb605e12e 686kB
harbocto.xxx.com.cn/public/rancher-agent v2.6.9 b59bfa0f5068b 220MB
registry.aliyuncs.com/k8sxio/pause 3.6 6270bb605e12e 302kB
如上可见，最后一个镜像是我们刚下载的
查看ctr的namespace
注意，这和k8s/k3s的namespace不是同一概念。
[root@k3s-test ~]# ctr namespace ls
NAME LABELS
default
k8s.io
moby
如上可见，有三个namespace——k8s.io（实际上，k8s和k3s使用的都是这个命名空间）。
用ctr命令打tag
[root@k3s-test ~]# ctr -n k8s.io i tag registry.aliyuncs.com/k8sxio/pause:3.6 registry.k8s.io/pause:3.6
registry.k8s.io/pause:3.6
ctr命令查看结果
[root@k3s-test ~]# ctr -n k8s.io images ls |grep pause
ctr -n k8s.io images ls |grep pause
registry.aliyuncs.com/k8sxio/pause:3.6 application/vnd.docker.distribution.manifest.list.v2+json sha256:3d380ca8864549e74af4b29c10f9cb0956236dfb01c40ca076fb6c37253234db 294.7 KiB linux/amd64,linux/arm/v7,linux/arm64,linux/ppc64le,linux/s390x,windows/amd64 io.cri-containerd.image=managed,io.cri-containerd.pinned=pinned
registry.aliyuncs.com/k8sxio/pause@sha256:3d380ca8864549e74af4b29c10f9cb0956236dfb01c40ca076fb6c37253234db application/vnd.docker.distribution.manifest.list.v2+json sha256:3d380ca8864549e74af4b29c10f9cb0956236dfb01c40ca076fb6c37253234db 294.7 KiB linux/amd64,linux/arm/v7,linux/arm64,linux/ppc64le,linux/s390x,windows/amd64 io.cri-containerd.image=managed,io.cri-containerd.pinned=pinned
registry.k8s.io/pause:3.6 application/vnd.docker.distribution.manifest.list.v2+json sha256:3d380ca8864549e74af4b29c10f9cb0956236dfb01c40ca076fb6c37253234db 294.7 KiB linux/amd64,linux/arm/v7,linux/arm64,linux/ppc64le,linux/s390x,windows/amd64 io.cri-containerd.image=managed,io.cri-containerd.pinned=pinned
crictl命令查看结果
[root@k3s-test ~]# crictl images
IMAGE TAG IMAGE ID SIZE
docker.io/rancher/klipper-helm v0.7.3-build20220613 38b3b9ad736af 239MB
docker.io/rancher/klipper-lb v0.3.5 dbd43b6716a08 8.51MB
docker.io/rancher/local-path-provisioner v0.0.21 fb9b574e03c34 35.3MB
docker.io/rancher/mirrored-coredns-coredns 1.9.1 99376d8f35e0a 49.7MB
docker.io/rancher/mirrored-library-busybox 1.34.1 7a80323521ccd 1.47MB
docker.io/rancher/mirrored-library-traefik 2.6.2 72463d8000a35 103MB
docker.io/rancher/mirrored-metrics-server v0.5.2 f73640fb50619 65.7MB
docker.io/rancher/mirrored-pause 3.6 6270bb605e12e 686kB
docker.io/rancher/rancher-agent v2.6.9 b59bfa0f5068b 220MB
harbocto.xxx.com.cn/public/rancher-agent v2.6.9 b59bfa0f5068b 220MB
registry.aliyuncs.com/k8sxio/pause 3.6 6270bb605e12e 302kB
registry.k8s.io/pause 3.6 6270bb605e12e 302kB
如上可见，ID为 6270bb605e12e的镜像多了一个tag
- 示例
ctr -n k8s.io i tag registry.aliyuncs.com/k8sxio/pause:3.6 registry.k8s.io/pause:3.6
参考链接：https://blog.csdn.net/xingzuo_1840/article/details/128833061