What I Learnt Today 2022-01-21

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在 Kubernetes Pod 和本地机器之间复制文件

使用 kubectl cp 命令 

Options:
  -c, --container='': Container name. If omitted, use the kubectl.kubernetes.io/default-container annotation for
          selecting the container to be attached or the first container in the pod will be chosen
  --no-preserve=false: The copied file/directory's ownership and permissions will not be preserved in the container

Usage:
  kubectl cp <file-spec-src> <file-spec-dest> [options]

示例

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# !!!Important Note!!!
# Requires that the 'tar' binary is present in your container
# image.  If 'tar' is not present, 'kubectl cp' will fail.
#
# For advanced use cases, such as symlinks, wildcard expansion or
# file mode preservation, consider using 'kubectl exec'.

# Copy /tmp/foo local file to /tmp/bar in a remote pod in namespace <some-namespace>
tar cf - /tmp/foo | kubectl exec -i -n <some-namespace> <some-pod> -- tar xf - -C /tmp/bar

# Copy /tmp/foo from a remote pod to /tmp/bar locally
kubectl exec -n <some-namespace> <some-pod> -- tar cf - /tmp/foo | tar xf - -C /tmp/bar

# Copy /tmp/foo_dir local directory to /tmp/bar_dir in a remote pod in the default namespace
kubectl cp /tmp/foo_dir <some-pod>:/tmp/bar_dir

# Copy /tmp/foo local file to /tmp/bar in a remote pod in a specific container
kubectl cp /tmp/foo <some-pod>:/tmp/bar -c <specific-container>

# Copy /tmp/foo local file to /tmp/bar in a remote pod in namespace <some-namespace>
kubectl cp /tmp/foo <some-namespace>/<some-pod>:/tmp/bar

# Copy /tmp/foo from a remote pod to /tmp/bar locally
kubectl cp <some-namespace>/<some-pod>:/tmp/foo /tmp/bar

WSL 中 git status 显示 git 仓库内的文件全部处于已修改状态

我有一些在 Windows 下创建的仓库。当运行 git status 时，它显示该分支中的所有文件都是最新的，除了几个未跟踪的文件外， 没有任何未提交的文件。当我在 Windows 的 Ubuntu WSL 上用 bash 运行 git status 时，它显示我的所有文件似乎都被修改了， 并且没有被缓存提交。

这个问题是由于 Windows 和 Linux 默认的换行符不一样导致的，只要在 WSL 执行这个命令就可以了： 

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git config --global core.autocrlf true