Docker实践
建立一个三节点的网络环境来进行docker的操作练习，其中master节点存储私有仓库镜像文件。
节点
IP
用途
master
192.168.174.181
管理节点和私有仓库
node1
192.168.174.180
节点一
node1
192.168.174.180
节点二
管理节点安装
docker程序的安装
[root@master ~]# yum install -y docker
[root@master ~]# fdisk -l
Disk /dev/sda: 10.7 GB, 10737418240 bytes, 20971520 sectors
Disk /dev/sdb: 10.7 GB, 10737418240 bytes, 20971520 sectors
# 这里我们将使用新增的/dev/sdb磁盘作为docker的存储
[root@master ~]# vim /etc/sysconfig/docker-storage-setup #使用:r 打开docker磁盘驱动模板文件/usr/share/container-storage-setup/container-storage-setup
#STORAGE_DRIVER=overlay2 #注释掉overlay2磁盘驱动
STORAGE_DRIVER=devicemapper #使用默认磁盘驱动
EXTRA_STORAGE_OPTIONS="--storage-opt dm.fs=xfs" #格式化为xfs
DEVS=/dev/sdb #使用dev/sdb磁盘
CONTAINER_THINPOOL=container-thinpool #thinpool的容器存储方式，也是lv的名字
VG=docker_VG #存储的vg名称
[root@master ~]# container-storage-setup
INFO: Writing zeros to first 4MB of device /dev/sdb
4+0 records in
4+0 records out
4194304 bytes (4.2 MB) copied, 0.00600853 s, 698 MB/s
INFO: Device node /dev/sdb1 exists.
Physical volume "/dev/sdb1" successfully created.
Volume group "docker_VG" successfully created
Rounding up size to full physical extent 12.00 MiB
Thin pool volume with chunk size 512.00 KiB can address at most 126.50 TiB of data.
Logical volume "container-thinpool" created.
Logical volume docker_VG/container-thinpool changed.
[root@master ~]# vgs
VG #PV #LV #SN Attr VSize VFree
centos 1 2 0 wz--n- <9.00g 0
docker_VG 1 1 0 wz--n- <10.00g 6.00g
[root@master ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
root centos -wi-ao---- <8.00g
swap centos -wi-ao---- 1.00g
container-thinpool docker_VG twi-a-t--- 3.97g 0.00 10.29
# 创建成功，启动docker服务
[root@master ~]# systemctl enable docker --now系统配置
通过配置多个加速器实现不同网络环境下的快速部署。
# Docker加速器配置
cat>/etc/docker/daemon.json<<EOF
{
"registry-mirrors": ["https://dockerhub.azk8s.cn","http://f1361db2.m.daocloud.io","https://d1a0f2854f4b44c2a3b3af4f5425db1a.mirror.swr.myhuaweicloud.com","https://hub-mirror.c.163.com","https://registry.docker-cn.com"]，
"insecure-registries": ["registry:5000"]
}
EOF
[root@master ~]# systemctl daemon-reload && systemctl restart docker
# 关闭防火墙
[root@master ~]# systemctl disable firewalld.service --now
# 关闭selinux
setenforce 0Docker环境准备
镜像准备
# 拉取实验镜像
[root@master ~]# docker pull docker.io/centos
Using default tag: latest
Trying to pull repository docker.io/library/centos ...
latest: Pulling from docker.io/library/centos
8a29a15cefae: Pull complete
Digest: sha256:fe8d824220415eed5477b63addf40fb06c3b049404242b31982106ac204f6700
Status: Downloaded newer image for docker.io/centos:latest
# 镜像列表
[root@master ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
docker.io/nginx latest 2073e0bcb60e 2 days ago 127 MB
docker.io/httpd latest c562eeace183 3 days ago 165 MB
docker.io/php latest 7dc31b4f3403 3 days ago 405 MB
docker.io/mysql latest 791b6e40940c 3 days ago 465 MB
docker.io/debian latest a8797652cfd9 3 days ago 114 MB
docker.io/registry latest 708bc6af7e5e 12 days ago 25.7 MB
docker.io/centos latest 470671670cac 2 weeks ago 237 MB
docker.io/mysql 5.5 d404d78aa797 9 months ago 205 MB
docker.io/centos 6.10 48650444e419 10 months ago 194 MB
# 删除镜像
[root@master ~]# docker rmi docker.io/mysql
Untagged: docker.io/mysql:latest
Untagged: docker.io/mysql@sha256:6d0741319b6a2ae22c384a97f4bbee411b01e75f6284af0cce339fee83d7e314
Deleted: sha256:791b6e40940cd550af522eb4ffe995226798204504fe495743445b900e417a51
Deleted: sha256:a3c92ad464abbee6d08856efd404df8c43e9d991b9253bed8281e452d8021dfa
Deleted: sha256:3eb0379ecdc39f86da90c491765187e40dda381e57f319dd21afd0b1e2c40158
Deleted: sha256:fe814f19102e93fd9e2c12b4c864d110bbe4884ff4c5c34e2e1d96341ec17778
Deleted: sha256:f973fa93f201d11a3a6ccf900614fa6e25f4cf899da69f163510560263642d0e
Deleted: sha256:db53286cf6b77826bd35675098bfa76863ace9a04b4e28f4d8340d53c23821e8
Deleted: sha256:477e19600de637164faac8d2e39d4552fac8fbf3c4a9f29efe34072c0fd156e9
Deleted: sha256:2c109aa38ef35164d5adcabac202bde92420867a5839deb75f5ce034aacc00b4
Deleted: sha256:0de337169373e6779cb3ca09485e95fedd4ac98abee19b839cd46e294a64f363
Deleted: sha256:73f1cb0f35d3377b825488e38241d0e12c63e7d30946362402dd8ab2e9467d81
Deleted: sha256:5807022bbb80a63e78831d4dff1ac497a450287ce43fbb0381623b19f5d45c8a
Deleted: sha256:1aaef8d601e09d40fc66f3531268e837f4ae3eedf84f94359fa33177f0be4c6e
Deleted: sha256:e0db3ba0aaea8a01d5cb000aeb449c153be0a47a369cafc4e912b85fb18192cf
# 镜像导出
[root@master ~]# docker save docker.io/centos:6.10 > /tmp/sujxcentos.tar
# 镜像导入
[root@node2 ~]# docker load < /root/sujxcentos.tar
[root@node2 ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
docker.io/centos 6.10 48650444e419 10 months ago 194 MB
# 检索镜像
[root@master ~]# docker search oracle
INDEX NAME DESCRIPTION STARS OFFICIAL AUTOMATED
docker.io docker.io/oraclelinux Official Docker builds of Oracle Linux. 629 [OK]
docker.io docker.io/jaspeen/oracle-11g Docker image for Oracle 11g database 144 [OK]
docker.io docker.io/oracleinanutshell/oracle-xe-11g 82
docker.io docker.io/oracle/openjdk Docker images containing OpenJDK Oracle Linux 60 [OK]
docker.io docker.io/oracle/graalvm-ce GraalVM Community Edition Official Image 56 [OK]
docker.io docker.io/absolutapps/oracle-12c-ee Oracle 12c EE image with web management co... 38
docker.io docker.io/araczkowski/oracle-apex-ords Oracle Express Edition 11g Release 2 on Ub... 27 [OK]
docker.io docker.io/bofm/oracle12c Docker image for Oracle Database 23 [OK]
docker.io docker.io/oracle/nosql Oracle NoSQL on a Docker Image with Oracle... 22 [OK]
docker.io docker.io/datagrip/oracle Oracle 11.2 & 12.1.0.2-se2 & 11.2.0.2-xe 14 [OK]
docker.io docker.io/oracle/weblogic-kubernetes-operator Docker images containing the Oracle WebLog... 10
docker.io docker.io/openweb/oracle-tomcat A fork off of Official tomcat image with O... 8 [OK]
docker.io docker.io/truevoly/oracle-12c Copy of sath89/oracle-12c image (https://g... 8
docker.io docker.io/18fgsa/oracle-client Hosted version of the Oracle Container Ima... 2 建立本地私有仓库
[root@master ~]# docker run -d -p 5000:5000 --name=registry --restart=always docker.io/registry
345e05f68235687b47d2917fd0a86620ac2d6b40fbe7647063b817e0d690cf6b
# 打标
[root@master ~]# docker tag docker.io/mysql:5.5 registry:5000/sujx_images/mysql:5.5
#上传
[root@master ~]# docker push registry:5000/sujx_images/mysql:5.5
The push refers to a repository [registry:5000/sujx_images/mysql]
c9f3545812c8: Pushed
f49eaacc87a0: Pushed
a9c5a24e943f: Pushed
90b4ae8695b5: Pushed
4054cc666efd: Pushed
f83622e85376: Pushed
af84b063c827: Pushed
ddc265b679cf: Pushed
647245c554e4: Pushed
432b5f62e513: Pushed
6270adb5794c: Pushed
5.5: digest: sha256:c9c671d0c959183154313d6830d46f9a00d5937f97415c15ebd3c6844f6f1467 size: 2619
# 本地其他客户端拉取
[root@node2 ~]# docker pull registry:5000/sujx_images/mysql:5.5
Trying to pull repository registry:5000/sujx_images/mysql ...
5.5: Pulling from registry:5000/sujx_images/mysql
743f2d6c1f65: Pull complete
3f0c413ee255: Pull complete
aef1ef8f1aac: Pull complete
f9ee573e34cb: Pull complete
3f237e01f153: Pull complete
03da1e065b16: Pull complete
04087a801070: Pull complete
7efd5395ab31: Pull complete
1b5cc03aaac8: Pull complete
2b7adaec9998: Pull complete
385b8f96a9ba: Pull complete
Digest: sha256:c9c671d0c959183154313d6830d46f9a00d5937f97415c15ebd3c6844f6f1467
Status: Downloaded newer image for registry:5000/sujx_images/mysql:5.5
# 本地其他节点上传镜像
[root@node2 ~]# docker tag docker.io/centos:6.10 registry:5000/sujx_images/centos:6.10
[root@node2 ~]# docker push registry:5000/sujx_images/centos:6.10
The push refers to a repository [registry:5000/sujx_images/centos]
8088cb617267: Pushed
6.10: digest: sha256:7e53308393264c34359fbdf6d15d5c8c4985b8c2a58ee0ad4f7d5cc2e3c1577a size: 529
All articles in this blog are licensed under CC BY-NC-SA 4.0 unless stating additionally.