Kubernetes crictl调试

2023-12-29 122

crictl 是 CRI 兼容的容器运行时命令行接口,用于管理和调试 Kubernetes 节点上的容器运行时和应用程序。crictl 的源代码托管在 cri-tools 代码库中,管理员可以在该代码库中获取最新版本的 crictl 工具,并根据需要进行自定义和编译。

一、准备

由于 crictl 是基于 CRI 标准开发的工具,因此它需要在安装有符合 CRI 标准的容器运行时的 Linux 操作系统上运行。

二、安装crictl

可以从 cri-tools 发布页面 下载一个压缩的 crictl 归档文件,用于几种不同的架构。 下载与 kubernetes 版本相对应的版本。 提取它并将其移动到系统路径上的某个位置,例如 /usr/local/bin/。

三、crictl用法

crictl 命令有几个子命令和运行时参数。 有关详细信息,请使用 crictl help 或 crictl <subcommand> help 获取帮助信息。

可以用以下方法之一来为 crictl 设置端点:

  • 设置参数 –runtime-endpoint 和 –image-endpoint;
  • 设置环境变量 CONTAINER_RUNTIME_ENDPOINT 和 IMAGE_SERVICE_ENDPOINT;
  • 在配置文件 –config=/etc/crictl.yaml 中设置端点。 要设置不同的文件,可以在运行 crictl 时使用 –config=PATH_TO_FILE 标志。

注意:如果不设置端点,crictl 将尝试连接到已知端点的列表,这可能会影响性能。

还可以在连接到服务器并启用或禁用调试时指定超时值,方法是在配置文件中指定 timeout 或 debug 值,或者使用 –timeout 和 –debug 命令行参数。

如果要查看或编辑当前配置,请查看或编辑 /etc/crictl.yaml 的内容。 例如,使用 containerd 容器运行时的配置会类似于这样:

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runtime-endpoint: unix:///var/run/containerd/containerd.sock
image-endpoint: unix:///var/run/containerd/containerd.sock
timeout: 10
debug: true
runtime-endpoint: unix:///var/run/containerd/containerd.sock image-endpoint: unix:///var/run/containerd/containerd.sock timeout: 10 debug: true
runtime-endpoint: unix:///var/run/containerd/containerd.sock
image-endpoint: unix:///var/run/containerd/containerd.sock
timeout: 10
debug: true

四、crictl命令示例

如果使用 crictl 在正在运行的 Kubernetes 集群上创建 Pod 沙盒或容器, kubelet 最终将删除它们。 crictl 不是一个通用的工作流工具,而是一个对调试有用的工具。

1、打印 Pod 清单

打印所有 Pod 的清单:

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crictl pods
crictl pods
crictl pods

输出类似于:

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POD ID CREATED STATE NAME NAMESPACE ATTEMPT
926f1b5a1d33a About a minute ago Ready sh-84d7dcf559-4r2gq default 0
4dccb216c4adb About a minute ago Ready nginx-65899c769f-wv2gp default 0
a86316e96fa89 17 hours ago Ready kube-proxy-gblk4 kube-system 0
919630b8f81f1 17 hours ago Ready nvidia-device-plugin-zgbbv kube-system 0
POD ID CREATED STATE NAME NAMESPACE ATTEMPT 926f1b5a1d33a About a minute ago Ready sh-84d7dcf559-4r2gq default 0 4dccb216c4adb About a minute ago Ready nginx-65899c769f-wv2gp default 0 a86316e96fa89 17 hours ago Ready kube-proxy-gblk4 kube-system 0 919630b8f81f1 17 hours ago Ready nvidia-device-plugin-zgbbv kube-system 0
POD ID              CREATED              STATE               NAME                         NAMESPACE           ATTEMPT
926f1b5a1d33a       About a minute ago   Ready               sh-84d7dcf559-4r2gq          default             0
4dccb216c4adb       About a minute ago   Ready               nginx-65899c769f-wv2gp       default             0
a86316e96fa89       17 hours ago         Ready               kube-proxy-gblk4             kube-system         0
919630b8f81f1       17 hours ago         Ready               nvidia-device-plugin-zgbbv   kube-system         0

根据名称打印 Pod 清单:

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crictl pods --name nginx-65899c769f-wv2gp
crictl pods --name nginx-65899c769f-wv2gp
crictl pods --name nginx-65899c769f-wv2gp

输出类似于这样:

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POD ID CREATED STATE NAME NAMESPACE ATTEMPT
4dccb216c4adb 2 minutes ago Ready nginx-65899c769f-wv2gp default 0
POD ID CREATED STATE NAME NAMESPACE ATTEMPT 4dccb216c4adb 2 minutes ago Ready nginx-65899c769f-wv2gp default 0
POD ID              CREATED             STATE               NAME                     NAMESPACE           ATTEMPT
4dccb216c4adb       2 minutes ago       Ready               nginx-65899c769f-wv2gp   default             0

根据标签打印 Pod 清单:

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crictl pods --label run=nginx
crictl pods --label run=nginx
crictl pods --label run=nginx

输出类似于这样:

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POD ID CREATED STATE NAME NAMESPACE ATTEMPT
4dccb216c4adb 2 minutes ago Ready nginx-65899c769f-wv2gp default 0
POD ID CREATED STATE NAME NAMESPACE ATTEMPT 4dccb216c4adb 2 minutes ago Ready nginx-65899c769f-wv2gp default 0
POD ID              CREATED             STATE               NAME                     NAMESPACE           ATTEMPT
4dccb216c4adb       2 minutes ago       Ready               nginx-65899c769f-wv2gp   default             0

2、打印镜像清单

打印所有镜像清单:

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crictl images
crictl images
crictl images

输出类似于这样:

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IMAGE TAG IMAGE ID SIZE
busybox latest 8c811b4aec35f 1.15MB
k8s-gcrio.azureedge.net/hyperkube-amd64 v1.10.3 e179bbfe5d238 665MB
k8s-gcrio.azureedge.net/pause-amd64 3.1 da86e6ba6ca19 742kB
nginx latest cd5239a0906a6 109MB
IMAGE TAG IMAGE ID SIZE busybox latest 8c811b4aec35f 1.15MB k8s-gcrio.azureedge.net/hyperkube-amd64 v1.10.3 e179bbfe5d238 665MB k8s-gcrio.azureedge.net/pause-amd64 3.1 da86e6ba6ca19 742kB nginx latest cd5239a0906a6 109MB
IMAGE                                     TAG                 IMAGE ID            SIZE
busybox                                   latest              8c811b4aec35f       1.15MB
k8s-gcrio.azureedge.net/hyperkube-amd64   v1.10.3             e179bbfe5d238       665MB
k8s-gcrio.azureedge.net/pause-amd64       3.1                 da86e6ba6ca19       742kB
nginx                                     latest              cd5239a0906a6       109MB

根据仓库打印镜像清单:

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crictl images nginx
crictl images nginx
crictl images nginx

输出类似于这样:

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IMAGE TAG IMAGE ID SIZE
nginx latest cd5239a0906a6 109MB
IMAGE TAG IMAGE ID SIZE nginx latest cd5239a0906a6 109MB
IMAGE               TAG                 IMAGE ID            SIZE
nginx               latest              cd5239a0906a6       109MB

只打印镜像 ID:

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crictl images -q
crictl images -q
crictl images -q

输出类似于这样:

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sha256:8c811b4aec35f259572d0f79207bc0678df4c736eeec50bc9fec37ed936a472a
sha256:e179bbfe5d238de6069f3b03fccbecc3fb4f2019af741bfff1233c4d7b2970c5
sha256:da86e6ba6ca197bf6bc5e9d900febd906b133eaa4750e6bed647b0fbe50ed43e
sha256:cd5239a0906a6ccf0562354852fae04bc5b52d72a2aff9a871ddb6bd57553569
sha256:8c811b4aec35f259572d0f79207bc0678df4c736eeec50bc9fec37ed936a472a sha256:e179bbfe5d238de6069f3b03fccbecc3fb4f2019af741bfff1233c4d7b2970c5 sha256:da86e6ba6ca197bf6bc5e9d900febd906b133eaa4750e6bed647b0fbe50ed43e sha256:cd5239a0906a6ccf0562354852fae04bc5b52d72a2aff9a871ddb6bd57553569
sha256:8c811b4aec35f259572d0f79207bc0678df4c736eeec50bc9fec37ed936a472a
sha256:e179bbfe5d238de6069f3b03fccbecc3fb4f2019af741bfff1233c4d7b2970c5
sha256:da86e6ba6ca197bf6bc5e9d900febd906b133eaa4750e6bed647b0fbe50ed43e
sha256:cd5239a0906a6ccf0562354852fae04bc5b52d72a2aff9a871ddb6bd57553569

3、打印容器清单

打印所有容器清单:

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crictl ps -a
crictl ps -a
crictl ps -a

输出类似于这样:

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CONTAINER ID IMAGE CREATED STATE NAME ATTEMPT
1f73f2d81bf98 busybox@sha256:141c253bc4c3fd0a201d32dc1f493bcf3fff003b6df416dea4f41046e0f37d47 7 minutes ago Running sh 1
9c5951df22c78 busybox@sha256:141c253bc4c3fd0a201d32dc1f493bcf3fff003b6df416dea4f41046e0f37d47 8 minutes ago Exited sh 0
87d3992f84f74 nginx@sha256:d0a8828cccb73397acb0073bf34f4d7d8aa315263f1e7806bf8c55d8ac139d5f 8 minutes ago Running nginx 0
1941fb4da154f k8s-gcrio.azureedge.net/hyperkube-amd64@sha256:00d814b1f7763f4ab5be80c58e98140dfc69df107f253d7fdd714b30a714260a 18 hours ago Running kube-proxy 0
CONTAINER ID IMAGE CREATED STATE NAME ATTEMPT 1f73f2d81bf98 busybox@sha256:141c253bc4c3fd0a201d32dc1f493bcf3fff003b6df416dea4f41046e0f37d47 7 minutes ago Running sh 1 9c5951df22c78 busybox@sha256:141c253bc4c3fd0a201d32dc1f493bcf3fff003b6df416dea4f41046e0f37d47 8 minutes ago Exited sh 0 87d3992f84f74 nginx@sha256:d0a8828cccb73397acb0073bf34f4d7d8aa315263f1e7806bf8c55d8ac139d5f 8 minutes ago Running nginx 0 1941fb4da154f k8s-gcrio.azureedge.net/hyperkube-amd64@sha256:00d814b1f7763f4ab5be80c58e98140dfc69df107f253d7fdd714b30a714260a 18 hours ago Running kube-proxy 0
CONTAINER ID        IMAGE                                                                                                             CREATED             STATE               NAME                       ATTEMPT
1f73f2d81bf98       busybox@sha256:141c253bc4c3fd0a201d32dc1f493bcf3fff003b6df416dea4f41046e0f37d47                                   7 minutes ago       Running             sh                         1
9c5951df22c78       busybox@sha256:141c253bc4c3fd0a201d32dc1f493bcf3fff003b6df416dea4f41046e0f37d47                                   8 minutes ago       Exited              sh                         0
87d3992f84f74       nginx@sha256:d0a8828cccb73397acb0073bf34f4d7d8aa315263f1e7806bf8c55d8ac139d5f                                     8 minutes ago       Running             nginx                      0
1941fb4da154f       k8s-gcrio.azureedge.net/hyperkube-amd64@sha256:00d814b1f7763f4ab5be80c58e98140dfc69df107f253d7fdd714b30a714260a   18 hours ago        Running             kube-proxy                 0

打印正在运行的容器清单:

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crictl ps
crictl ps
crictl ps

输出类似于这样:

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CONTAINER ID IMAGE CREATED STATE NAME ATTEMPT
1f73f2d81bf98 busybox@sha256:141c253bc4c3fd0a201d32dc1f493bcf3fff003b6df416dea4f41046e0f37d47 6 minutes ago Running sh 1
87d3992f84f74 nginx@sha256:d0a8828cccb73397acb0073bf34f4d7d8aa315263f1e7806bf8c55d8ac139d5f 7 minutes ago Running nginx 0
1941fb4da154f k8s-gcrio.azureedge.net/hyperkube-amd64@sha256:00d814b1f7763f4ab5be80c58e98140dfc69df107f253d7fdd714b30a714260a 17 hours ago Running kube-proxy 0
CONTAINER ID IMAGE CREATED STATE NAME ATTEMPT 1f73f2d81bf98 busybox@sha256:141c253bc4c3fd0a201d32dc1f493bcf3fff003b6df416dea4f41046e0f37d47 6 minutes ago Running sh 1 87d3992f84f74 nginx@sha256:d0a8828cccb73397acb0073bf34f4d7d8aa315263f1e7806bf8c55d8ac139d5f 7 minutes ago Running nginx 0 1941fb4da154f k8s-gcrio.azureedge.net/hyperkube-amd64@sha256:00d814b1f7763f4ab5be80c58e98140dfc69df107f253d7fdd714b30a714260a 17 hours ago Running kube-proxy 0
CONTAINER ID        IMAGE                                                                                                             CREATED             STATE               NAME                       ATTEMPT
1f73f2d81bf98       busybox@sha256:141c253bc4c3fd0a201d32dc1f493bcf3fff003b6df416dea4f41046e0f37d47                                   6 minutes ago       Running             sh                         1
87d3992f84f74       nginx@sha256:d0a8828cccb73397acb0073bf34f4d7d8aa315263f1e7806bf8c55d8ac139d5f                                     7 minutes ago       Running             nginx                      0
1941fb4da154f       k8s-gcrio.azureedge.net/hyperkube-amd64@sha256:00d814b1f7763f4ab5be80c58e98140dfc69df107f253d7fdd714b30a714260a   17 hours ago        Running             kube-proxy                 0

4、在正在运行的容器上执行命令

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crictl exec -i -t 1f73f2d81bf98 ls
crictl exec -i -t 1f73f2d81bf98 ls
crictl exec -i -t 1f73f2d81bf98 ls

输出类似于这样:

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bin dev etc home proc root sys tmp usr var
bin dev etc home proc root sys tmp usr var
bin   dev   etc   home  proc  root  sys   tmp   usr   var

5、获取容器日志

获取容器的所有日志:

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crictl logs 87d3992f84f74
crictl logs 87d3992f84f74
crictl logs 87d3992f84f74

输出类似于这样:

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10.240.0.96 - - [06/Jun/2018:02:45:49 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.47.0" "-"
10.240.0.96 - - [06/Jun/2018:02:45:50 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.47.0" "-"
10.240.0.96 - - [06/Jun/2018:02:45:51 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.47.0" "-"
10.240.0.96 - - [06/Jun/2018:02:45:49 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.47.0" "-" 10.240.0.96 - - [06/Jun/2018:02:45:50 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.47.0" "-" 10.240.0.96 - - [06/Jun/2018:02:45:51 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.47.0" "-"
10.240.0.96 - - [06/Jun/2018:02:45:49 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.47.0" "-"
10.240.0.96 - - [06/Jun/2018:02:45:50 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.47.0" "-"
10.240.0.96 - - [06/Jun/2018:02:45:51 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.47.0" "-"

获取最近的 N 行日志:

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crictl logs --tail=1 87d3992f84f74
crictl logs --tail=1 87d3992f84f74
crictl logs --tail=1 87d3992f84f74

输出类似于这样:

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10.240.0.96 - - [06/Jun/2018:02:45:51 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.47.0" "-"
10.240.0.96 - - [06/Jun/2018:02:45:51 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.47.0" "-"
10.240.0.96 - - [06/Jun/2018:02:45:51 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.47.0" "-"

6、运行 Pod 沙盒

用 crictl 运行 Pod 沙盒对容器运行时排错很有帮助。 在运行的 Kubernetes 集群中,沙盒会随机地被 kubelet 停止和删除。

编写下面的 JSON 文件:

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{
"metadata": {
"name": "nginx-sandbox",
"namespace": "default",
"attempt": 1,
"uid": "hdishd83djaidwnduwk28bcsb"
},
"log_directory": "/tmp",
"linux": {
}
}
{ "metadata": { "name": "nginx-sandbox", "namespace": "default", "attempt": 1, "uid": "hdishd83djaidwnduwk28bcsb" }, "log_directory": "/tmp", "linux": { } }
{
"metadata": {
"name": "nginx-sandbox",
"namespace": "default",
"attempt": 1,
"uid": "hdishd83djaidwnduwk28bcsb"
},
"log_directory": "/tmp",
"linux": {
}
}

使用 crictl runp 命令应用 JSON 文件并运行沙盒。

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crictl runp pod-config.json
crictl runp pod-config.json
crictl runp pod-config.json

返回了沙盒的 ID。

7、创建容器

用 crictl 创建容器对容器运行时排错很有帮助。 在运行的 Kubernetes 集群中,沙盒会随机地被 kubelet 停止和删除。

拉取 busybox 镜像:

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crictl pull busybox
crictl pull busybox
crictl pull busybox
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Image is up to date for busybox@sha256:141c253bc4c3fd0a201d32dc1f493bcf3fff003b6df416dea4f41046e0f37d47
Image is up to date for busybox@sha256:141c253bc4c3fd0a201d32dc1f493bcf3fff003b6df416dea4f41046e0f37d47
Image is up to date for busybox@sha256:141c253bc4c3fd0a201d32dc1f493bcf3fff003b6df416dea4f41046e0f37d47

创建 Pod 和容器的配置:

Pod 配置:

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{
"metadata": {
"name": "busybox-sandbox",
"namespace": "default",
"attempt": 1,
"uid": "aewi4aeThua7ooShohbo1phoj"
},
"log_directory": "/tmp",
"linux": {
}
}
{ "metadata": { "name": "busybox-sandbox", "namespace": "default", "attempt": 1, "uid": "aewi4aeThua7ooShohbo1phoj" }, "log_directory": "/tmp", "linux": { } }
{
"metadata": {
"name": "busybox-sandbox",
"namespace": "default",
"attempt": 1,
"uid": "aewi4aeThua7ooShohbo1phoj"
},
"log_directory": "/tmp",
"linux": {
}
}

容器配置:

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{
"metadata": {
"name": "busybox"
},
"image":{
"image": "busybox"
},
"command": [
"top"
],
"log_path":"busybox.log",
"linux": {
}
}
{ "metadata": { "name": "busybox" }, "image":{ "image": "busybox" }, "command": [ "top" ], "log_path":"busybox.log", "linux": { } }
{
"metadata": {
"name": "busybox"
},
"image":{
"image": "busybox"
},
"command": [
"top"
],
"log_path":"busybox.log",
"linux": {
}
}

创建容器,传递先前创建的 Pod 的 ID、容器配置文件和 Pod 配置文件。返回容器的 ID。

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crictl create f84dd361f8dc51518ed291fbadd6db537b0496536c1d2d6c05ff943ce8c9a54f container-config.json pod-config.json
crictl create f84dd361f8dc51518ed291fbadd6db537b0496536c1d2d6c05ff943ce8c9a54f container-config.json pod-config.json
crictl create f84dd361f8dc51518ed291fbadd6db537b0496536c1d2d6c05ff943ce8c9a54f container-config.json pod-config.json

查询所有容器并确认新创建的容器状态为 Created。

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crictl ps -a
crictl ps -a
crictl ps -a

输出类似于这样:

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CONTAINER ID IMAGE CREATED STATE NAME ATTEMPT
3e025dd50a72d busybox 32 seconds ago Created busybox 0
CONTAINER ID IMAGE CREATED STATE NAME ATTEMPT 3e025dd50a72d busybox 32 seconds ago Created busybox 0
CONTAINER ID        IMAGE               CREATED             STATE               NAME                ATTEMPT
3e025dd50a72d       busybox             32 seconds ago      Created             busybox             0

8、启动容器

要启动容器,要将容器 ID 传给 crictl start:

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crictl start 3e025dd50a72d956c4f14881fbb5b1080c9275674e95fb67f965f6478a957d60
crictl start 3e025dd50a72d956c4f14881fbb5b1080c9275674e95fb67f965f6478a957d60
crictl start 3e025dd50a72d956c4f14881fbb5b1080c9275674e95fb67f965f6478a957d60

输出类似于这样:

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3e025dd50a72d956c4f14881fbb5b1080c9275674e95fb67f965f6478a957d60
3e025dd50a72d956c4f14881fbb5b1080c9275674e95fb67f965f6478a957d60
3e025dd50a72d956c4f14881fbb5b1080c9275674e95fb67f965f6478a957d60

确认容器的状态为 Running。

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crictl ps
crictl ps
crictl ps

输出类似于这样:

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CONTAINER ID IMAGE CREATED STATE NAME ATTEMPT
3e025dd50a72d busybox About a minute ago Running busybox 0
CONTAINER ID IMAGE CREATED STATE NAME ATTEMPT 3e025dd50a72d busybox About a minute ago Running busybox 0
CONTAINER ID   IMAGE    CREATED              STATE    NAME     ATTEMPT
3e025dd50a72d  busybox  About a minute ago   Running  busybox  0
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