docker 之cp命令使用

╰半橙微兮° 2022-06-12 08:26 320阅读 0赞

为了比较详细地描述docker ps 地用法，首先得了解我用来  
说明的镜像的dockerfile  
如下

➜  openresty git:(master) cat Dockerfile 
    FROM harbor.enncloud.cn/qinzhao-harbor/ubuntu-openresty:v1.0.0
    
    ENV PATH /usr/local/openresty/nginx/sbin:$PATH
    
    ADD nginx.conf /work/conf/
    
    WORKDIR /work/
    
    EXPOSE 8080
    
    #CMD ["nginx", "-g", "daemon off;"] CMD /usr/local/openresty/nginx/sbin/nginx -g 'daemon off;' -c /work/conf/nginx.conf

➜  openresty git:(master) sudo docker images
    REPOSITORY                                           TAG                  IMAGE ID            CREATED             SIZE
    reg.enncloud.cn/qinzhao-harbor/ubuntu-openresty      v1.0.14              6f086fe82845        46 hours ago        482 MB

**以上就是我用来说明的镜像**  
**1. 从 container 到 主机（host）**

docker cp <containerId>:/file/path/within/container /host/path/target

现在我要从镜像v1.0.14所起的容器中cp /work/conf/nginx.conf 文件  
**docker run**

➜  openresty git:(master) sudo docker run -d -p 9090:8080 reg.enncloud.cn/qinzhao-harbor/ubuntu-openresty:v1.0.14
    Password:
    4bbb4313ac0d9401255dc116d6aa9f381a5bcd04e96a611b7139cc6dfb612d7f

➜  openresty git:(master) ll
    total 16
    -rw-r--r--  1 xinzhiyun  staff   292B  7 17 23:59 Dockerfile
    -rw-r--r--  1 xinzhiyun  staff     0B  7 18 00:08 README.md
    -rw-r--r--  1 xinzhiyun  staff   294B  7 17 22:44 nginx.conf
    drwxr-xr-x  2 xinzhiyun  staff    68B  7 19 21:39 test
    ➜  openresty git:(master) ls test 
    ➜  openresty git:(master)

**docker cp**

➜  openresty git:(master) sudo docker cp 4bbb4313ac0d:/work/conf/nginx.conf ./test/
    ➜  openresty git:(master) ✗ ll test 
    total 8
    -rw-r--r--  1 root  staff   294B  7 17 22:44 nginx.conf

**2. 从 主机（host） 到 container**

➜  openresty git:(master) ✗ sudo docker exec -it 4bbb4313ac0d sh
    # ls
    conf  logs
    # cd
    # pwd
    /root
    # ls
    #

➜  openresty git:(master) ✗ sudo docker cp test/nginx.conf 4bbb4313ac0d:/root/
    Password:
    ➜  openresty git:(master) ✗

➜  openresty git:(master) ✗ sudo docker exec -it 4bbb4313ac0d sh
    # pwd
    /root
    # ls
    nginx.conf
    #

**之后 你docker commit 就可以保存该容器为新镜像了**