kubernetes容器上的远程命令执行

2024-5-31 • tag-icon

我有一个 kubernetes 集群，我正在尝试检查在其上运行的容器的磁盘利用率。

$kubectl version
Client Version: version.Info{Major:"1", Minor:"5", GitVersion:"v1.5.8", GitCommit:"e8c167a115ec662726904265d17f75a6d79d78d8", GitTreeState:"clean", BuildDate:"2017-10-01T00:19:21Z", GoVersion:"go1.7.6", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"5", GitVersion:"v1.5.8", GitCommit:"e8c167a115ec662726904265d17f75a6d79d78d8", GitTreeState:"clean", BuildDate:"2017-10-01T00:01:59Z", GoVersion:"go1.7.6", Compiler:"gc", Platform:"linux/amd64"}

这对我有用

$kubectl -n example-system exec -it example-monitoring-0 df
Filesystem           1K-blocks      Used Available Use% Mounted on
overlay               98227828  17592896  76340692  19% /
tmpfs                 15701160         0  15701160   0% /dev
tmpfs                 15701160         0  15701160   0% /sys/fs/cgroup
/dev/xvdbg           309506048 149730860 146106552  51% /prometheus
/dev/xvda1            98227828  17592896  76340692  19% /dev/termination-log
/dev/xvda1            98227828  17592896  76340692  19% /etc/prometheus
/dev/xvda1            98227828  17592896  76340692  19% /etc/resolv.conf
/dev/xvda1            98227828  17592896  76340692  19% /etc/hostname
/dev/xvda1            98227828  17592896  76340692  19% /etc/hosts
shm                      65536         0     65536   0% /dev/shm
tmpfs                 15701160        12  15701148   0% /var/run/secrets/kubernetes.io/serviceaccount
tmpfs                 15701160         0  15701160   0% /proc/kcore
tmpfs                 15701160         0  15701160   0% /proc/timer_list
tmpfs                 15701160         0  15701160   0% /proc/timer_stats
tmpfs                 15701160         0  15701160   0% /proc/sched_debug

但这对我来说不起作用

$kubectl -n example-system exec -it example-monitoring-0 df -kh
Error: unknown shorthand flag: 'k' in -kh


Examples:
  # Get output from running 'date' from pod 123456-7890, using the first container by default
  kubectl exec 123456-7890 date

  # Get output from running 'date' in ruby-container from pod 123456-7890
  kubectl exec 123456-7890 -c ruby-container date

  # Switch to raw terminal mode, sends stdin to 'bash' in ruby-container from pod 123456-7890
  # and sends stdout/stderr from 'bash' back to the client
  kubectl exec 123456-7890 -c ruby-container -i -t -- bash -il

Options:
  -c, --container='': Container name. If omitted, the first container in the pod will be chosen
  -p, --pod='': Pod name
  -i, --stdin=false: Pass stdin to the container
  -t, --tty=false: Stdin is a TTY

Usage:
  kubectl exec POD [-c CONTAINER] -- COMMAND [args...] [options]

Use "kubectl options" for a list of global command-line options (applies to all commands).

实际上我尝试了以下组合但没有效果。

kubectl -n example-system exec -it example-monitoring-0 `df -kh`
kubectl -n example-system exec -it example-monitoring-0 'df -kh'
kubectl -n example-system exec -it example-monitoring-0 "df -kh"
cmd="df -kh"
kubectl -n example-system exec -it example-monitoring-0 $cmd
kubectl -n example-system exec -it example-monitoring-0 echo $cmd

我希望有人一定遇到过这样的问题。

答案1

您可能需要使用双破折号分隔符，这通常意味着没有更多的命令选项，并且其后的所有内容都被视为带有空格的字符串。

$ kubectl -n example-system exec -it example-monitoring-0 -- df -kh

这里这是 Unix&Linux 网站上关于此问题的热门问题。

答案1

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