Docker的报错与解决

启动容器报错

宿主机是win10，安装docker后，拉取了一个centos镜像，又在镜像上安装docker（禁止套娃），安装docker-ce时报错

Failed to get D-Bus connection: Operation not permitted

解决办法

以下方式生成容器

docker run -d --privileged=true -e "container=docker" container /

usr/sbin/init

进入容器

docker exec -it container /bin/bash

如果容器已经生成，只能重新从镜像根据上一条命令生成容器了。

Docker服务未启动

进入centos中，运行docker命令报错

# docker run hello-world
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running? ## 解决办法 重启daemon和docker.service

systemctl daemon-reload
systemctl restart docker.service 运行第二条命令时报错

Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details. 根据提示输入命令

systemctl status docker.service 出现如下信息

● docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
Active: failed (Result: start-limit) since Tue 2020-01-07 01:03:24 UTC; 49s ago
    Docs: https://docs.docker.com
Process: 758 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock (code=exited, status=1/FAILURE)
Main PID: 758 (code=exited, status=1/FAILURE)

Jan 07 01:03:22 cc019bed9d66 systemd[1]: Failed to start Docker Application Container Engine.
Jan 07 01:03:22 cc019bed9d66 systemd[1]: Unit docker.service entered failed state.
Jan 07 01:03:22 cc019bed9d66 systemd[1]: docker.service failed.
Jan 07 01:03:24 cc019bed9d66 systemd[1]: docker.service holdoff time over, scheduling restart.
Jan 07 01:03:24 cc019bed9d66 systemd[1]: Stopped Docker Application Container Engine.
Jan 07 01:03:24 cc019bed9d66 systemd[1]: start request repeated too quickly for docker.service
Jan 07 01:03:24 cc019bed9d66 systemd[1]: Failed to start Docker Application Container Engine.
Jan 07 01:03:24 cc019bed9d66 systemd[1]: Unit docker.service entered failed state.
Jan 07 01:03:24 cc019bed9d66 systemd[1]: docker.service failed. 看不出来错误出在哪里，直接运行dockerd

# dockerd
INFO[2020-01-07T01:05:31.603772600Z] Starting up
INFO[2020-01-07T01:05:31.607475700Z] parsed scheme: "unix"                         module=grpc
INFO[2020-01-07T01:05:31.607632300Z] scheme "unix" not registered, fallback to default scheme  module=grpc
INFO[2020-01-07T01:05:31.607702300Z] ccResolverWrapper: sending update to cc: {[{unix:///run/containerd/containerd.sock 0  <nil>}] <nil>}  module=grpc
INFO[2020-01-07T01:05:31.607749300Z] ClientConn switching balancer to "pick_first"  module=grpc
INFO[2020-01-07T01:05:31.610274600Z] parsed scheme: "unix"                         module=grpc
INFO[2020-01-07T01:05:31.610376900Z] scheme "unix" not registered, fallback to default scheme  module=grpc
INFO[2020-01-07T01:05:31.610406400Z] ccResolverWrapper: sending update to cc: {[{unix:///run/containerd/containerd.sock 0  <nil>}] <nil>}  module=grpc
INFO[2020-01-07T01:05:31.611694200Z] ClientConn switching balancer to "pick_first"  module=grpc
WARN[2020-01-07T01:05:31.628316400Z] Usage of loopback devices is strongly discouraged for production use. Please use `--storage-opt dm.thinpooldev` or use `man dockerd` to refer to dm.thinpooldev section.  
storage-driver=devicemapper
WARN[2020-01-07T01:05:31.847038500Z] XFS is not supported in your system (exec: "mkfs.xfs": executable file not found in $PATH). Defaulting to ext4 filesystem  storage-driver=devicemapper
INFO[2020-01-07T01:05:31.851265700Z] Creating filesystem ext4 on device docker-0:98-59386-base, mkfs args: [/dev/mapper/docker-0:98-59386-base]  storage-driver=devicemapper
INFO[2020-01-07T01:05:31.851792400Z] Error while creating filesystem ext4 on device docker-0:98-59386-base: exec: "mkfs.ext4": executable file not found in $PATH  storage-driver=devicemapper
ERRO[2020-01-07T01:05:31.851883500Z] [graphdriver] prior storage driver devicemapper failed: exec: "mkfs.ext4": executable file not found in $PATH
failed to start daemon: error initializing graphdriver: exec: "mkfs.ext4": executable file not found in $PATH 最后一条，提示缺少**mkfs.ext4**，使用以下命令安装

yum install -y e4fsprogs
# 加载ext4模块
modprobe ext4 重启docker服务

systemctl restart docker # 创建镜像时提示空间不足
no space left on device ## 解决办法 查看docker磁盘信息
    
docker system df
TYPE                TOTAL               ACTIVE              SIZE                RECLAIMABLE
Images              11                  1                   2.43GB              1.912GB (78%)
Containers          1                   1                   109.6GB             0B (0%)
Local Volumes       0                   0                   0B                  0B
Build Cache         0                   0                   0B                  0B ### 清理无用的系统空间
    
docker system prune ### 清理无用的卷
docker volume prune