Containerd基础

一、Containerd 安装

1、安装

yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
yum -y install containerd
containerd config default > /etc/containerd/config.toml
systemctl enable containerd.service
systemctl start containerd.service

2、替换 containerd 默认的sand_box镜像

#替换默认pause镜像
sed -i 's/k8s.gcr.io\/pause:3.2/registry.baidubce.com\/k8s.gcr.io\/pause:3.2/g' /etc/containerd/config.toml
#修改默认Cgroup驱动
sed -i 's/SystemdCgroup = false/SystemdCgroup = true/g' /etc/containerd/config.toml
#配置镜像加速器


systemctl daemon-reload
systemctl restart containerd

二、Containerd 容器常用操作

1、创建容器

#下载nginx镜像
ctr -n k8s.io i pull docker.io/library/nginx:latest

#创建一个container
ctr -n k8s.io container create docker.io/library/nginx:latest nginx


#创建一个task
ctr -n k8s.io task start -d nginx
ctr -n k8s.io task ls

#精简版命令
ctr -n k8s.io run -d docker.io/library/nginx:latest nginx02

#查看containerd在宿主机的pid
ctr -n k8s.io task ls
TASK       PID     STATUS    
nginx02    4755    RUNNING

ps ajxf|grep "containerd-shim-runc\|4755"|grep -v grep

2、查看并进入容器

ctr -n k8s.io container ls
ctr -n k8s.io t exec --exec-id $RANDOM -t nginx02 sh

3、发送SIGKILL信号量杀死该容器

ctr -n k8s.io t kill -s SIGKILL nginx02
ctr -n k8s.io container rm nginx02

4、清理未被容器引用的镜像

crictl rmi --prune