自己动手写Docker系列 -- 4.1使用busybox创建容器

简介

目前docker demo中还是使用的系统原有proc，不怎么纯净，本篇中使用busybox来更换docker demo的系统挂载点

源码说明

同时放到了Gitee和Github上，都可进行获取

• Gitee: https://gitee.com/free-love/docker-demo
• GitHub: https://github.com/lw1243925457/dockerDemo

本章节对应的版本标签是：4.1，防止后面代码过多，不好查看，可切换到标签版本进行查看

效果查看

下面是在没有修改代码前的我们的docker的挂载情况，可以看到非常的庞大，不纯净

➜  dockerDemo git:(main) ✗ ./main run -ti /bin/sh
{
   
   "level":"info","msg":"conmand all is /bin/sh","time":"2022-03-17T05:44:58+08:00"}
{
   
   "level":"info","msg":"memory cgroup path: /sys/fs/cgroup/memory/mydocker-cgroup","time":"2022-03-17T05:44:58+08:00"}
{
   
   "level":"info","msg":"memory cgroup path: /sys/fs/cgroup/memory/mydocker-cgroup","time":"2022-03-17T05:44:58+08:00"}
{
   
   "level":"info","msg":"parent process run","time":"2022-03-17T05:44:58+08:00"}
{
   
   "level":"info","msg":"init come on","time":"2022-03-17T05:44:58+08:00"}
{
   
   "level":"info","msg":"command: /bin/sh, args: [/bin/sh]","time":"2022-03-17T05:44:58+08:00"}
{
   
   "level":"info","msg":"RunContainerInitProcess command /bin/sh, args [/bin/sh]","time":"2022-03-17T05:44:58+08:00"}
{
   
   "level":"info","msg":"find path: /bin/sh","time":"2022-03-17T05:44:58+08:00"}
# pwd
/home/lw/code/go/dockerDemo
# ls -l
总用量 4668
drwxrwxr-x 2 lw lw    4096 3月  17 05:44 docs
drwxrwxr-x 3 lw lw    4096 3月   7 04:55 example
-rw-rw-r-- 1 lw lw     382 3月  12 10:18 go.mod
-rw-rw-r-- 1 lw lw    1965 3月  12 10:18 go.sum
-rw-rw-r-- 1 lw lw   11558 3月  12 10:18 LICENSE
-rwxrwxr-x 1 lw lw 4741951 3月  14 20:58 main
drwxrwxr-x 6 lw lw    4096 3月  12 10:20 mydocker
-rw-rw-r-- 1 lw lw     473 3月  12 10:18 README.md
# mount
/dev/sda2 on / type ext4 (rw,relatime,errors=remount-ro)
udev on /dev type devtmpfs (rw,nosuid,noexec,relatime,size=16103592k,nr_inodes=4025898,mode=755,inode64)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev,inode64)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,pagesize=2M)
mqueue on /dev/mqueue type mqueue (rw,nosuid,nodev,noexec,relatime)
tmpfs on /run type tmpfs (rw,nosuid,nodev,noexec,relatime,size=3227448k,mode=755,inode64)
tmpfs on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k,inode64)
tmpfs on /run/user/125 type tmpfs (rw,nosuid,nodev,relatime,size=3227444k,mode=700,uid=125,gid=130,inode64)
gvfsd-fuse on /run/user/125/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,relatime,user_id=125,group_id=130)
tmpfs on /run/user/0 type tmpfs (rw,nosuid,nodev,relatime,size=3227444k,mode=700,inode64)
gvfsd-fuse on /run/user/0/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,relatime,user_id<