1. Ubuntu安装containerd

以下以Ubuntu为例

说明：安装containerd与安装docker流程基本一致，差别在于不需要安装docker-ce

containerd: apt-get install -y containerd.io

docker: apt-get install docker-ce docker-ce-cli containerd.io

1. 卸载旧版本

1	sudo apt-get remove docker docker-engine docker.io containerd runc

如果需要删除镜像及容器数据则执行以下命令

1 2	sudo rm -rf /var/lib/docker sudo rm -rf /var/lib/containerd

2. 准备包环境

1、更新apt，允许使用https。

sudo apt-get update
sudo apt-get install \
   ca-certificates \
   curl \
   gnupg \
   lsb-release

2、添加docker官方GPG key。

1 2	sudo mkdir -p /etc/apt/keyrings curl -fsSL https://download.docker.com/linux/ubuntu/gpg \| sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg

3、设置软件仓库源

1
2
3

echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

3. 安装containerd

# 安装containerd
sudo apt-get update
sudo apt-get install -y containerd.io

# 如果是安装docker则执行：
sudo apt-get install docker-ce docker-ce-cli containerd.io

# 查看运行状态
systemctl enable containerd
systemctl status containerd

安装指定版本

# 查看版本
apt-cache madison containerd

# sudo apt-get install containerd=<VERSION>

4. 修改配置

在 Linux 上，containerd 的默认 CRI 套接字是 /run/containerd/containerd.sock。

1、生成默认配置

1	containerd config default > /etc/containerd/config.toml

2、修改CgroupDriver为systemd

k8s官方推荐使用systemd类型的CgroupDriver。

[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
  ...
  [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
    SystemdCgroup = true

3、重启containerd

1	systemctl restart containerd

2. 离线二进制安装containerd

把containerd、runc、cni-plugins、nerdctl二进制下载到本地，再上传到对应服务器，解压文件到对应目录，修改containerd配置文件，启动containerd。

#!/bin/bash
set -e

ContainerdVersion=$1
ContainerdVersion=${ContainerdVersion:-1.6.6}

RuncVersion=$2
RuncVersion=${RuncVersion:-1.1.3}

CniVersion=$3
CniVersion=${CniVersion:-1.1.1}

NerdctlVersion=$4
NerdctlVersion=${NerdctlVersion:-0.21.0}

CrictlVersion=$5
CrictlVersion=${CrictlVersion:-1.24.2}

echo "--------------install containerd--------------"
wget https://github.com/containerd/containerd/releases/download/v${ContainerdVersion}/containerd-${ContainerdVersion}-linux-amd64.tar.gz
tar Cxzvf /usr/local containerd-${ContainerdVersion}-linux-amd64.tar.gz

echo "--------------install containerd service--------------"
wget https://raw.githubusercontent.com/containerd/containerd/681aaf68b7dcbe08a51c3372cbb8f813fb4466e0/containerd.service
mv containerd.service /lib/systemd/system/

mkdir -p /etc/containerd/
containerd config default > /etc/containerd/config.toml
sed -i 's/SystemdCgroup = false/SystemdCgroup = true/' /etc/containerd/config.toml

echo "--------------install runc--------------"
wget https://github.com/opencontainers/runc/releases/download/v${RuncVersion}/runc.amd64
chmod +x runc.amd64
mv runc.amd64 /usr/local/bin/runc

echo "--------------install cni plugins--------------"
wget https://github.com/containernetworking/plugins/releases/download/v${CniVersion}/cni-plugins-linux-amd64-v${CniVersion}.tgz
rm -fr /opt/cni/bin
mkdir -p /opt/cni/bin
tar Cxzvf /opt/cni/bin cni-plugins-linux-amd64-v${CniVersion}.tgz

echo "--------------install nerdctl--------------"
wget https://github.com/containerd/nerdctl/releases/download/v${NerdctlVersion}/nerdctl-${NerdctlVersion}-linux-amd64.tar.gz
tar Cxzvf /usr/local/bin nerdctl-${NerdctlVersion}-linux-amd64.tar.gz

echo "--------------install crictl--------------"
wget https://github.com/kubernetes-sigs/cri-tools/releases/download/v${CrictlVersion}/crictl-v${CrictlVersion}-linux-amd64.tar.gz
tar Cxzvf /usr/local/bin crictl-v${CrictlVersion}-linux-amd64.tar.gz

cat > /etc/crictl.yaml << \EOF
runtime-endpoint: unix:///run/containerd/containerd.sock
image-endpoint: unix:///run/containerd/containerd.sock
timeout: 2
debug: false
pull-image-on-create: false
EOF

# 启动containerd服务
systemctl daemon-reload
systemctl enable contaienrd
systemctl restart contaienrd

3. Containerd配置代理

由于节点到k8s官方仓库网络不通，或者设备处于内网，可以通过配置http_proxy代理的方式来拉取镜像。

vi /lib/systemd/system/containerd.service

# 添加代理环境变量
 [Unit]
Description=containerd container runtime
Documentation=https://containerd.io
After=network.target local-fs.target

[Service]
Environment="HTTP_PROXY=http://squid:3128/"   # 添加环境变量代理
Environment="HTTPS_PROXY=http://squid:3128/"  # 添加环境变量代理
ExecStartPre=-/sbin/modprobe overlay
ExecStart=/usr/local/bin/containerd

Type=notify
Delegate=yes
KillMode=process
Restart=always
RestartSec=5
# Having non-zero Limit*s causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
LimitNPROC=infinity
LimitCORE=infinity
LimitNOFILE=infinity
# Comment TasksMax if your systemd version does not supports it.
# Only systemd 226 and above support this version.
TasksMax=infinity
OOMScoreAdjust=-999

[Install]
WantedBy=multi-user.target


# 重启服务
systemctl daemon-reload
systemctl restart containerd

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安装Containerd