文章目錄

如何獲取容器的啟動命令
1, 容器層：檔案存放路徑
- 后天修改容器埠
- - a, 先提交舊容器為新的鏡像，再啟動新容器
  - b, 修改容器組態檔置檔案：hostconfig.json
2, 鏡像層：檔案存放路徑
- a, 容器層,鏡像層：關聯
- - I, 子容器：拷貝鏡像的檔案
  - II, 子容器：添加新檔案
  - III, 子容器：修改由鏡像拷貝的檔案
- b, 在鏡像層(檔案存盤目錄)，修改組態檔
3, 修改默認存盤路徑
- a, 重建/var/lib/docker目錄
- b, 修改配置

如何獲取容器的啟動命令

容器早已創建好，如何得知它的啟動引數(資料掛載到哪)

#假設通過如下命令啟動了一個容器
docker run  -d  --name mysql_cdh \
-p 3306:3306 \
-e MYSQL_ROOT_PASSWORD=123456 \
-v mysql-data:/var/lib/mysql \
--restart=always \
mysql:5.5 --character-set-server=utf8

#如何通過容器名得知啟動引數
[root@jenkins ~]# docker inspect mysql_cdh
[
    {
        "Id": "3aad772538b5e86705d3358362517a08d53f951aa6522e2881321135f05c8872",
        "Created": "2019-09-25T01:43:37.720505875Z",
        "Path": "docker-entrypoint.sh",
        "Args": [
            "--character-set-server=utf8"
        ],
        ...
        "Name": "/mysql_cdh",
     
	  	"HostConfig": {
	            "Binds": [
	                "mysql-data:/var/lib/mysql"
	            ],
	            ...
	            "NetworkMode": "default",
	            "PortBindings": {
	                "3306/tcp": [
	                    {
	                        "HostIp": "",
	                        "HostPort": "3306"
	                    }
	                ]
	            },
	            "RestartPolicy": {
	                "Name": "always",
	                "MaximumRetryCount": 0
	            },
	
    	"Mounts": [
	            {
	                "Type": "volume",
	                "Name": "mysql-data",
	                "Source": "/var/lib/docker/volumes/mysql-data/_data",
	                "Destination": "/var/lib/mysql",
	                "Driver": "local",
	                "Mode": "z",
	                "RW": true,
	                "Propagation": ""
	            }
	        ],
	
		"Config": {
	            "Hostname": "3aad772538b5",
	             ...
	            "ExposedPorts": {
	                "3306/tcp": {}
	            },
				...
	            "Env": [
	                "MYSQL_ROOT_PASSWORD=123456",
	                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/mysql/bin:/usr/local/mysql/scripts",
	                "GOSU_VERSION=1.7",
	                "MYSQL_MAJOR=5.5",
	                "MYSQL_VERSION=5.5.62"
	            ],
	            "Cmd": [
	                "--character-set-server=utf8"
	            ],

1, 容器層：檔案存放路徑

#1, 啟動容器
[root@master ~]# docker run -d --name nginx2 nginx
a9c9f31cdccf13c3385f3de33443325d2e14d69458e6d679e54c8cf9e5ff24c8

#2, 獲取容器id
[root@master ~]# docker inspect nginx2  | grep -i id 
[root@master ~]# docker inspect nginx2  | grep -i id 
        "Id": "a9c9f31cdccf13c3385f3de33443325d2e14d69458e6d679e54c8cf9e5ff24c8",
            "Pid": 2069,
        "ExecIDs": null,
            "ContainerIDFile": "",
			
#查看容器臨時檔案--每次創建時隨機生成的檔案(容器層)
# /var/lib/docker/containers/容器id
[root@master ~]# docker inspect nginx2  | grep -i path
  "Path": "nginx",
  "ResolvConfPath": "/var/lib/docker/containers/a9c9f31cdccf13c3385f3de33443325d2e14d69458e6d679e54c8cf9e5ff24c8/resolv.conf",
  "HostnamePath": "/var/lib/docker/containers/a9c9f31cdccf13c3385f3de33443325d2e14d69458e6d679e54c8cf9e5ff24c8/hostname",
  "HostsPath": "/var/lib/docker/containers/a9c9f31cdccf13c3385f3de33443325d2e14d69458e6d679e54c8cf9e5ff24c8/hosts",
  "LogPath": "/var/lib/docker/containers/a9c9f31cdccf13c3385f3de33443325d2e14d69458e6d679e54c8cf9e5ff24c8/a9c9f31cdccf13c3385f3de33443325d2e14d69458e6d679e54c8cf9e5ff24c8-json.log",

后天修改容器埠

a, 先提交舊容器為新的鏡像，再啟動新容器

需要確保：資料卷映射完全一致（新舊的容器，在資料卷上要一致）

[root1@c7-docker ~]#  docker inspect mysql_port |egrep -i 'volum|Mount' -A 2
            "Volumes": {
                "/var/lib/mysql": {}
            },
--
            "Volumes": {
                "/var/lib/mysql": {}
            },

保存容器為鏡像，再啟動新容器是，添加埠映射

##############  1, 啟動一個容器 ############## 
[root1@c7-docker ~]# docker run --name t1 -d -e MYSQL_ROOT_PASSWORD=123456 -v mysql-test-dir:/var/lib/mysql/ -p 3308:3306 mysql:5.5
53f2a3c53d4c6769897ee484c3d2ff4e3f82ea1e390d4950b2162c08af05d7cc

[root1@c7-docker ~]# docker ps
CONTAINER ID        IMAGE                             COMMAND                  CREATED             STATUS              PORTS                                              NAMES
53f2a3c53d4c        mysql:5.5                         "docker-entrypoint.s…"   3 seconds ago       Up 3 seconds        0.0.0.0:3308->3306/tcp                             t1

[root1@c7-docker ~]# mysql -uroot -p123456 -P3308 --protocol tcp
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.5.62 MySQL Community Server (GPL)
MySQL [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
+--------------------+
3 rows in set (0.00 sec)

MySQL [(none)]> create database test;
Query OK, 1 row affected (0.00 sec)

MySQL [(none)]> use test;
Database changed
MySQL [test]> create table t1(id int);
Query OK, 0 rows affected (0.00 sec)

MySQL [test]> insert into t1 values(1),(2),(3);
Query OK, 3 rows affected (0.00 sec)
Records: 3  Duplicates: 0  Warnings: 0

MySQL [test]> select * from t1;
+------+
| id   |
+------+
|    1 |
|    2 |
|    3 |
+------+
3 rows in set (0.00 sec)



 
############## 2, 提交當前容器環境--保存為新的鏡像 ############## 
[root1@c7-docker ~]# docker commit -m mysql_test_chag-port_img  t1 mysql_port
sha256:9f90be3c200c6a8b535478375c4caf86d589d231afae1293d28026f9248f8ae3
[root1@c7-docker ~]# docker images
REPOSITORY                  TAG                 IMAGE ID            CREATED             SIZE
mysql_port                  latest              9f90be3c200c        3 seconds ago       205MB
mysql                       5.5                 d404d78aa797        18 months ago       205MB



############## 3, 停止舊容器, 啟動新容器 ############## 
[root1@c7-docker ~]# docker stop t1
t1
[root1@c7-docker ~]# docker run --name t2 -d -v mysql-test-dir:/var/lib/mysql/ -p 3309:3306 mysql_port
fd7cefe55db8bb2687ab044ff1473f0c935ac5ce867df81b3b13f570e9026868
[root1@c7-docker ~]# docker ps
CONTAINER ID        IMAGE                             COMMAND                  CREATED             STATUS              PORTS                                              NAMES
fd7cefe55db8        mysql_port                        "docker-entrypoint.s…"   3 seconds ago       Up 2 seconds        0.0.0.0:3309->3306/tcp                             t2

[root1@c7-docker ~]# mysql -uroot -p123456 -P3309 --protocol tcp
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.5.62 MySQL Community Server (GPL)
MySQL [(none)]> show databases;

MySQL [(none)]> use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
MySQL [test]> select * from t1;
+------+
| id   |
+------+
|    1 |
|    2 |
|    3 |
+------+
3 rows in set (0.00 sec)

b, 修改容器組態檔置檔案：hostconfig.json

要先停止docker服務,否則不生效
通過容器層檔案，找到組態檔hostconfig.json，修改容器映射的埠

[root@docker a9c9f31cd...ff24c8]# pwd
/var/lib/docker/containers/d93185e3a0....2e544ccfa
[root@docker a9c9f31cd...ff24c8]# cat hostconfig.json 
{"Binds":["/dockersuperset:/home/superset"],"ContainerIDFile":"",
"LogConfig":{"Type":"json-file","Config":{}},"NetworkMode":"default",
"PortBindings":{"8088/tcp":[{"HostIp":"","HostPort":"8099"}]}......

2, 鏡像層：檔案存放路徑

[root@master ~]# docker image inspect nginx |tail  -n 22
        "GraphDriver": {
            "Data": {
                "LowerDir": "/var/lib/docker/overlay2/bf20cf788cc053f00ff1467525d50e19bd1cf07a2167f72511bdfcb28918a472/diff:/var/lib/docker/overlay2/317d80bb7ae58ed288be9ebd84aeb5b4b3a1c06f3211f5d1f32d89b629d1876e/diff",
                "MergedDir": "/var/lib/docker/overlay2/7782d0eb292fdc8bbd73bf9bae2d65468e8aba0bcd6baed55ac348618b80ae16/merged",
                "UpperDir": "/var/lib/docker/overlay2/7782d0eb292fdc8bbd73bf9bae2d65468e8aba0bcd6baed55ac348618b80ae16/diff",
                "WorkDir": "/var/lib/docker/overlay2/7782d0eb292fdc8bbd73bf9bae2d65468e8aba0bcd6baed55ac348618b80ae16/work"
            },
            "Name": "overlay2"
        },

a, 容器層,鏡像層：關聯

I, 子容器：拷貝鏡像的檔案

在這里插入圖片描述

II, 子容器：添加新檔案

在這里插入圖片描述

III, 子容器：修改由鏡像拷貝的檔案

在這里插入圖片描述

b, 在鏡像層(檔案存盤目錄)，修改組態檔

# 進入鏡容器檔案存盤目錄， 修改組態檔
[root@master d37ff828e6308...0c0599b]# ls diff/run/
nginx.pid
[root@master d37ff828e6308...0c0599b]# ls diff/var/cache/nginx/
client_temp  fastcgi_temp  proxy_temp  scgi_temp  uwsgi_temp

[root@master d37ff828e6308...0c0599b]# ls merged/
bin/        dev/        etc/        lib/        media/      opt/        root/       sbin/       sys/        usr/        
boot/       .dockerenv  home/       lib64/      mnt/        proc/       run/        srv/        tmp/        var/        

[root@master d37ff828e6308...0c0599b]# ls merged/etc/nginx/
conf.d  fastcgi_params  koi-utf  koi-win  mime.types  modules  nginx.conf  scgi_params  uwsgi_params  win-utf

[root@master d37ff828e6308...0c0599b]# head merged/etc/nginx/nginx.conf 
user  nginx;
worker_processes  1;

#在此處修改組態檔，把user nginx; worker_process 1; 這兩行的分號去掉，看容器里面的配置是否更改
[root@master d37ff828e6308...0c0599b]# head merged/etc/nginx/nginx.conf -n 3
user  nginx
worker_processes  1

#登陸容器，查看修改的配置： 驗證是否生效
[root@master d37ff828e6308...0c0599b]# docker exec -it nginx2 bash
root@a9c9f31cdccf:/# head /etc/nginx/nginx.conf -n 3
user  nginx
worker_processes  1

3, 修改默認存盤路徑

a, 重建/var/lib/docker目錄

#備份資料到新的存放路徑
service docker stop
mkdir /docker.bak
mv /var/lib/docker/*  /docker.bak

#創建軟連接
mkdir /home/docker-data
mv /docker.bak/*  /home/docker-data/ && rmdir /docker.bak
ln -s   /home/docker-data  /var/lib/docker

b, 修改配置

vi /usr/lib/systemd/system/docker.service  
ExecStart=/usr/bin/dockerd --graph /new-path/docker 

#reload組態檔 
systemctl daemon-reload 
#重啟docker 
systemctl restart docker.service

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docker 檔案存放路徑, 修改埠映射

文章目錄

如何獲取容器的啟動命令

1, 容器層：檔案存放路徑

后天修改容器埠

a, 先提交舊容器為新的鏡像，再啟動新容器

b, 修改容器組態檔置檔案：hostconfig.json

2, 鏡像層：檔案存放路徑

a, 容器層,鏡像層：關聯

I, 子容器：拷貝鏡像的檔案

II, 子容器：添加新檔案

III, 子容器：修改由鏡像拷貝的檔案

b, 在鏡像層(檔案存盤目錄)， 修改組態檔

3, 修改默認存盤路徑

a, 重建/var/lib/docker目錄

b, 修改配置

b, 在鏡像層(檔案存盤目錄)，修改組態檔