Docker 热迁移探索，基于CRIU实现状态迁移_dockrr criu

版本限制

• Docker: 17.06.0-ce
• criu: 3.12
• kernal: 3.10.0-957.el7.x86_64 || 5.10.2-1.el7.elrepo.x86_64 (Optional)
• os: CentOS Linux release 7.9.2009 (Core) (Optional)

实测在该环境下，容器热迁移可用，热迁移成功与否与 docker 和 criu 版本强相关。

环境部署

# Docker 安装
$ sudo yum install -y yum-utils
$ sudo yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo
$ sudo yum list docker-ce --showduplicates | sort -r
$ sudo yum install docker-ce-17.06.0.ce

# 启动Docker实验特征
vim **/etc/docker/daemon.json
+ {
    "experimental": true }

#** 启动docker并设置开机自启
****$ sudo systemctl enable docker
$ sudo systemctl start docker

# criu 安装
$ sudo yum install criu -y

# Go安装(可选)
wget https://golang.org/dl/go1.15.6.linux-amd64.tar.gz
tar -C /usr/local -xzf go1.15.6.linux-amd64.tar.gz
vim /etc/profile
+ export PATH=$PATH:/usr/local/go/bin
source /etc/profile
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热迁移示例

# On the host
$ docker run -d --name looper2 --security-opt seccomp:unconfined busybox \
         /bin/sh -c 'i=0; while true; do echo $i; i=$(expr $i + 1); sleep 1; done'

# wait a few seconds to give the container an opportunity to print a few lines, then
$ docker checkpoint create looper2 checkpoint2

# check your container & print log file
$ docker logs looper2

# On the client
$ docker create --name looper-clone --security-opt seccomp:unconfined busybox \
        
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