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docker服务无法启动的解决方案(layer does not exist)

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近期一台服务器上的docker无法启动，查看日志发现报告的是：msg=”Error starting daemon: layer does not exist”

现象

反复重启也无法启动，日志里面可以看到：

msg=”Error starting daemon: layer does not exist”

其实有的时候可能还会有其他的一些文件系统错误啥的日志。

解决

到网上搜索后发现似乎没啥好的办法，只能是清空/var/lib/docker目录了，实际上官方还提供了一个略微安全的删除脚本：

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#!/bin/sh
set -e

dir="$1"

if [ -z "$dir" ]; then
	{
		echo 'This script is for destroying old /var/lib/docker directories more safely than'
		echo '  "rm -rf", which can cause data loss or other serious issues.'
		echo
		echo "usage: $0 directory"
		echo "   ie: $0 /var/lib/docker"
	} >&2
	exit 1
fi

if [ "$(id -u)" != 0 ]; then
	echo >&2 "error: $0 must be run as root"
	exit 1
fi

if [ ! -d "$dir" ]; then
	echo >&2 "error: $dir is not a directory"
	exit 1
fi

dir="$(readlink -f "$dir")"

echo
echo "Nuking $dir ..."
echo '  (if this is wrong, press Ctrl+C NOW!)'
echo

( set -x; sleep 10 )
echo

dir_in_dir() {
	inner="$1"
	outer="$2"
	[ "${inner#$outer}" != "$inner" ]
}

# let's start by unmounting any submounts in $dir
#   (like -v /home:... for example - DON'T DELETE MY HOME DIRECTORY BRU!)
for mount in $(awk '{ print $5 }' /proc/self/mountinfo); do
	mount="$(readlink -f "$mount" || true)"
	if dir_in_dir "$mount" "$dir"; then
		( set -x; umount -f "$mount" )
	fi
done

# now, let's go destroy individual btrfs subvolumes, if any exist
if command -v btrfs > /dev/null 2>&1; then
	root="$(df "$dir" | awk 'NR>1 { print $NF }')"
	root="${root#/}" # if root is "/", we want it to become ""
	for subvol in $(btrfs subvolume list -o "$root/" 2>/dev/null | awk -F' path ' '{ print $2 }' | sort -r); do
		subvolDir="$root/$subvol"
		if dir_in_dir "$subvolDir" "$dir"; then
			( set -x; btrfs subvolume delete "$subvolDir" )
		fi
	done
fi

# finally, DESTROY ALL THINGS
( set -x; rm -rf "$dir" )

将该脚本保存到本地后运行，清空/var/lib/docker目录，重启docker服务，果然好使了。

参考

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