Question

使用v1.5.1功能运行kubectl run/exec -i --tty时遇到问题。

发送数据时，连接不会中断。所以，当我启动一个交互式容器会话时，脚本会不时地输出一些东西，它似乎有效。

基于此，我创建了一个讨厌的解决方法来保持我的容器会话继续进行，而没有我的交互。这些会议过早终止真的很烦人。他们留下垃圾，需要清理，以防你附加到正在运行的生产容器。

解决方法（每隔59秒将一个空格字符打印到STDERR作为后台进程）：

# within your container session
$ while :; do sleep 59; echo -n ' ' >&2; done &

当我不启动这样的脚本时，请参阅以下输出。 它表明交互式会话在约2分钟内过早终止。

如果您正在利用此功能来调试正在运行的应用程序和容器安装，那真的很烦人。

$ time kubectl run -i --tty busybox --image=busybox --restart=Never -- sh
Waiting for pod default/busybox to be running, status is Pending, pod ready: false
If you don't see a command prompt, try pressing enter.
/ # Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
Waiting for pod default/busybox to terminate, status is Running
error: timed out waiting for the condition

real    2m4.657s

从此Github Issue重新发帖。

Answer 1

我现在已经解决了这个问题。该问题是由通过AWS LoadBalancer（ELB或ALB）提供Kubernetes API引起的。这些会在超时后终止连接，导致kubectl与Kubernetes API服务器之间断开连接。

这本身不是Kubernetes的问题，它与您如何向最终用户提供Kubernetes API服务器有关。在这种情况下，需要使用负载均衡器。

快速解决方法：增加超时时间或不时通过电线发送数据以保持连接打开。

如何配置kubernetes以允许长时间运行的交互式会话？

1 个答案: