因为对docker了解不是深入（不是开发docker）。但把docker的配置文件研究透彻，会起到“事半功倍”的效果。下面只是随笔记一下，不能成为博客，若以后有深入研究，再详细整理。

一、问题集锦

【问题1 一个已经停止的容器，再次启动报Unknown runtime specified docker-runc】

[root@localhost ~]# docker start 389fcaab1ca4 
Error response from daemon: Unknown runtime specified docker-runc
Error: failed to start containers: 389fcaab1ca4
[root@localhost ~]# 

解决方法：

[root@localhost containers]# vi /var/lib/docker/containers/容器ID/hostconfig.json

修改里面"Runtime":"docker-runc"，修改为"Runtime":"runc"

原因：不详。

【问题2 Device is Busy delete container(25f59daf0cda) failed.】

[root@localhost]#docker rm 25f59daf0cda
Error response from daemon: Driver devicemapper failed to remove root filesystem 25f59daf0cdaa93a204e3033cc6bfd1e836aab978138962029e2bd938241c626: Device is Busy
delete container(25f59daf0cda) failed.
[root@localhost]#

 定位过程：

通过docker  ps 查看容器状态是Dead状态（如果是Eixt状态应该可以正常删除），

[root@localhost]#docker ps -a | grep 25f59daf0cda
25f59daf0cda        nginx   "/opt/startup"           7 days ago          Dead      nginx-110112
[root@localhost]#

参考此网站： https://blog.terminus.io/docker-device-is-busy/

 

【配置集锦】

用户级配置文件：

/etc/docker/daemon.json（没有则自己创建）

daemon.json样例：

{

    "api-cors-header": "",

    "authorization-plugins": [],

    "bip": "",

    "bridge": "", /* 指定网桥 */

    "cgroup-parent": "",

    "cluster-store": "",

    "cluster-store-opts": {},

    "cluster-advertise": "",

    "debug": true, /* 日志级别 如果是true则打印详细日志信息 */

    "default-gateway": "",

    "default-gateway-v6": "",

    "default-runtime": "runc",

    "default-ulimits": {},

    "disable-legacy-registry": false,

    "dns": [],

    "dns-opts": [],

    "dns-search": [],

    "exec-opts": [],

    "exec-root": "",

    "fixed-cidr": "",

    "fixed-cidr-v6": "",

    "graph": "",

    "group": "",

    "hosts": [],

    "icc": false,

    "insecure-registries": [],

    "ip": "0.0.0.0",

    "iptables": false,

    "ipv6": false,

    "ip-forward": false,

    "ip-masq": false,

    "labels": [],

    "live-restore": true,

    "log-driver": "",

    "log-level": "",

    "log-opts": {},

    "max-concurrent-downloads": 3,

    "max-concurrent-uploads": 5,

    "mtu": 0,

    "oom-score-adjust": -500,

    "pidfile": "",

    "raw-logs": false,

    "registry-mirrors": [],

    "runtimes": {

        "runc": {

            "path": "runc"

        },

        "custom": {

            "path": "/usr/local/bin/my-runc-replacement",

            "runtimeArgs": [

                "--debug"

            ]

        }

    },

    "selinux-enabled": false,

    "storage-driver": "",

    "storage-opts": [],

    "swarm-default-advertise-addr": "",

    "tls": true,

    "tlscacert": "",

    "tlscert": "",

    "tlskey": "",

    "tlsverify": true,

    "userland-proxy": false,

    "userns-remap": ""

}

 

 

 

系统级配置文件：

/lib/systemd/system/docker.service  ---> 启动服务脚本：systemctl start docker 命令就是调用此配置文件