Kubernetes 1.20 上将容器从 Docker Engine 改为 Containerd
官网参考：https://kubernetes.io/zh-cn/docs/tasks/administer-cluster/migrating-from-dockershim/change-runtime-containerd/
1、配置先决条件【如果k8s环境初始化的时候如果做过了，直接忽略】
$ cat <2、下线节点
将
替换为你所要下线的节点的名称
kubectl drain --ignore-daemonsets
3、停止 Docker 守护进程
systemctl stop kubelet
systemctl disable docker.service --now
4、二进制安装containerd
$ wget https://github.com/containerd/containerd/releases/download/v1.7.20/containerd-1.7.20-linux-amd64.tar.gz
$ tar -xf containerd-1.7.20-linux-amd64.tar.gz
#复制bin下所有二进制文件到/usr/bin 目录下,并覆盖之前的文件
$ cp bin/* /usr/bin/
cp：是否覆盖'/usr/bin/containerd'？ y
cp：是否覆盖'/usr/bin/containerd-shim'？ y
cp：是否覆盖'/usr/bin/containerd-shim-runc-v2'？ y
cp：是否覆盖'/usr/bin/ctr'？ y
#验证containerd的版本
$ containerd --version
containerd github.com/containerd/containerd v1.7.20 8fc6bcff51318944179630522a095cc9dbf9f353
#创建containerd 配置文件
$ mkdir -p /etc/containerd
#也可以使用生成的默认配置
$ containerd config default | sudo tee /etc/containerd/config.toml
修改containerd配置文件
$ cat > /etc/containerd/config.toml << EOF
disabled_plugins = []
imports = []
oom_score = 0
plugin_dir = ""
required_plugins = []
root = "/var/lib/containerd"
state = "/run/containerd"
temp = ""
version = 2
[cgroup]
path = ""
[debug]
address = ""
format = ""
gid = 0
level = ""
uid = 0
[grpc]
address = "/run/containerd/containerd.sock"
gid = 0
max_recv_message_size = 16777216
max_send_message_size = 16777216
tcp_address = ""
tcp_tls_ca = ""
tcp_tls_cert = ""
tcp_tls_key = ""
uid = 0
[metrics]
address = ""
grpc_histogram = false
[plugins]
[plugins."io.containerd.gc.v1.scheduler"]
deletion_threshold = 0
mutation_threshold = 100
pause_threshold = 0.02
schedule_delay = "0s"
startup_delay = "100ms"
[plugins."io.containerd.grpc.v1.cri"]
device_ownership_from_security_context = false
disable_apparmor = false
disable_cgroup = false
disable_hugetlb_controller = true
disable_proc_mount = false
disable_tcp_service = true
enable_selinux = false
enable_tls_streaming = false
enable_unprivileged_icmp = false
enable_unprivileged_ports = false
ignore_image_defined_volumes = false
max_concurrent_downloads = 3
max_container_log_line_size = 16384
netns_mounts_under_state_dir = false
restrict_oom_score_adj = false
sandbox_image = "registry.aliyuncs.com/google_containers/pause:3.6"
selinux_category_range = 1024
stats_collect_period = 10
stream_idle_timeout = "4h0m0s"
stream_server_address = "127.0.0.1"
stream_server_port = "0"
systemd_cgroup = false
tolerate_missing_hugetlb_controller = true
unset_seccomp_profile = ""
[plugins."io.containerd.grpc.v1.cri".cni]
bin_dir = "/opt/cni/bin"
conf_dir = "/etc/cni/net.d"
conf_template = ""
ip_pref = ""
max_conf_num = 1
[plugins."io.containerd.grpc.v1.cri".containerd]
default_runtime_name = "runc"
disable_snapshot_annotations = true
discard_unpacked_layers = false
ignore_rdt_not_enabled_errors = false
no_pivot = false
snapshotter = "overlayfs"
[plugins."io.containerd.grpc.v1.cri".containerd.default_runtime]
base_runtime_spec = ""
cni_conf_dir = ""
cni_max_conf_num = 0
container_annotations = []
pod_annotations = []
privileged_without_host_devices = false
runtime_engine = ""
runtime_path = ""
runtime_root = ""
runtime_type = ""
[plugins."io.containerd.grpc.v1.cri".containerd.default_runtime.options]
[plugins."io.containerd.grpc.v1.cri".containerd.runtimes]
[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
base_runtime_spec = ""
cni_conf_dir = ""
cni_max_conf_num = 0
container_annotations = []
pod_annotations = []
privileged_without_host_devices = false
runtime_engine = ""
runtime_path = ""
runtime_root = ""
runtime_type = "io.containerd.runc.v2"
[plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc.options]
BinaryName = ""
CriuImagePath = ""
CriuPath = ""
CriuWorkPath = ""
IoGid = 0
IoUid = 0
NoNewKeyring = false
NoPivotRoot = false
Root = ""
ShimCgroup = ""
SystemdCgroup = true
[plugins."io.containerd.grpc.v1.cri".containerd.untrusted_workload_runtime]
base_runtime_spec = ""
cni_conf_dir = ""
cni_max_conf_num = 0
container_annotations = []
pod_annotations = []
privileged_without_host_devices = false
runtime_engine = ""
runtime_path = ""
runtime_root = ""
runtime_type = ""
[plugins."io.containerd.grpc.v1.cri".containerd.untrusted_workload_runtime.options]
[plugins."io.containerd.grpc.v1.cri".image_decryption]
key_model = "node"
[plugins."io.containerd.grpc.v1.cri".registry]
config_path = ""
[plugins."io.containerd.grpc.v1.cri".registry.auths]
[plugins."io.containerd.grpc.v1.cri".registry.configs]
[plugins."io.containerd.grpc.v1.cri".registry.headers]
[plugins."io.containerd.grpc.v1.cri".registry.mirrors]
[plugins."io.containerd.grpc.v1.cri".registry.mirrors."docker.io"]
endpoint = [
"https://docker.srebro.site"
]
[plugins."io.containerd.grpc.v1.cri".registry.mirrors."gcr.io"]
endpoint = [
"https://gcr.srebro.site"
]
[plugins."io.containerd.grpc.v1.cri".registry.mirrors."k8s.gcr.io"]
endpoint = [
"https://k8s-gcr.srebro.site"
]
[plugins."io.containerd.grpc.v1.cri".registry.mirrors."quay.io"]
endpoint = [
"https://quay.srebro.site"
]
[plugins."io.containerd.grpc.v1.cri".x509_key_pair_streaming]
tls_cert_file = ""
tls_key_file = ""
[plugins."io.containerd.internal.v1.opt"]
path = "/opt/containerd"
[plugins."io.containerd.internal.v1.restart"]
interval = "10s"
[plugins."io.containerd.internal.v1.tracing"]
sampling_ratio = 1.0
service_name = "containerd"
[plugins."io.containerd.metadata.v1.bolt"]
content_sharing_policy = "shared"
[plugins."io.containerd.monitor.v1.cgroups"]
no_prometheus = false
[plugins."io.containerd.runtime.v1.linux"]
no_shim = false
runtime = "runc"
runtime_root = ""
shim = "containerd-shim"
shim_debug = false
[plugins."io.containerd.runtime.v2.task"]
platforms = ["linux/amd64"]
sched_core = false
[plugins."io.containerd.service.v1.diff-service"]
default = ["walking"]
[plugins."io.containerd.service.v1.tasks-service"]
rdt_config_file = ""
[plugins."io.containerd.snapshotter.v1.aufs"]
root_path = ""
[plugins."io.containerd.snapshotter.v1.btrfs"]
root_path = ""
[plugins."io.containerd.snapshotter.v1.devmapper"]
async_remove = false
base_image_size = ""
discard_blocks = false
fs_options = ""
fs_type = ""
pool_name = ""
root_path = ""
[plugins."io.containerd.snapshotter.v1.native"]
root_path = ""
[plugins."io.containerd.snapshotter.v1.overlayfs"]
root_path = ""
upperdir_label = false
[plugins."io.containerd.snapshotter.v1.zfs"]
root_path = ""
[plugins."io.containerd.tracing.processor.v1.otlp"]
endpoint = ""
insecure = false
protocol = ""
[proxy_plugins]
[stream_processors]
[stream_processors."io.containerd.ocicrypt.decoder.v1.tar"]
accepts = ["application/vnd.oci.image.layer.v1.tar+encrypted"]
args = ["--decryption-keys-path", "/etc/containerd/ocicrypt/keys"]
env = ["OCICRYPT_KEYPROVIDER_CONFIG=/etc/containerd/ocicrypt/ocicrypt_keyprovider.conf"]
path = "ctd-decoder"
returns = "application/vnd.oci.image.layer.v1.tar"
[stream_processors."io.containerd.ocicrypt.decoder.v1.tar.gzip"]
accepts = ["application/vnd.oci.image.layer.v1.tar+gzip+encrypted"]
args = ["--decryption-keys-path", "/etc/containerd/ocicrypt/keys"]
env = ["OCICRYPT_KEYPROVIDER_CONFIG=/etc/containerd/ocicrypt/ocicrypt_keyprovider.conf"]
path = "ctd-decoder"
returns = "application/vnd.oci.image.layer.v1.tar+gzip"
[timeouts]
"io.containerd.timeout.bolt.open" = "0s"
"io.containerd.timeout.shim.cleanup" = "5s"
"io.containerd.timeout.shim.load" = "5s"
"io.containerd.timeout.shim.shutdown" = "3s"
"io.containerd.timeout.task.state" = "2s"
[ttrpc]
address = ""
gid = 0
uid = 0
EOF
使用systemd管理containerd ，并启动
$ cat > /etc/systemd/system/containerd.service << EOF
[Unit]
Description=containerd container runtime
Documentation=https://containerd.io
After=network.target
[Service]
ExecStart=/usr/bin/containerd
Restart=always
RestartSec=5
Delegate=yes
KillMode=process
OOMScoreAdjust=-999
[Install]
WantedBy=multi-user.target
EOF
$ systemctl daemon-reload
$ systemctl enable containerd
$ systemctl restart containerd
5、配置kubelet使用containerd并重启kubelet
$ vim /etc/sysconfig/kubelet
KUBELET_EXTRA_ARGS=--container-runtime=remote --container-runtime-endpoint=unix:///run/containerd/containerd.sock --cgroup-driver=systemd
$ systemctl restart kubelet
6、验证节点处于健康状态
# 会显示出containerd版本，健康状态
$ kubectl get nodes -o wide
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
k8s-master Ready control-plane,master 7d21h v1.20.15 172.22.33.210 openEuler 22.03 (LTS-SP4) 5.10.0-221.0.0.124.oe2203sp3.x86_64 containerd://1.7.20
k8s-node1 Ready,SchedulingDisabled 7d21h v1.20.15 172.22.33.211 openEuler 22.03 (LTS-SP4) 5.10.0-221.0.0.124.oe2203sp3.x86_64 containerd://1.7.20
k8s-node2 Ready 7d21h v1.20.15 172.22.33.212 openEuler 22.03 (LTS-SP4) 5.10.0-221.0.0.124.oe2203sp3.x86_64 containerd://1.7.20
k8s-node3 Ready 6d22h v1.20.15 172.22.33.213 openEuler 22.03 (LTS-SP4) 5.10.0-221.0.0.124.oe2203sp3.x86_64 containerd://1.7.20
7、uncordon 节点
将
替换为你之前下线的节点的名称。
$ kubectl uncordon
8、再次验证
[root@k8s-master bin]# kubectl get nodes -o wide
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
k8s-master Ready control-plane,master 7d21h v1.20.15 172.22.33.210 openEuler 22.03 (LTS-SP4) 5.10.0-221.0.0.124.oe2203sp3.x86_64 containerd://1.7.20
k8s-node1 Ready 7d21h v1.20.15 172.22.33.211 openEuler 22.03 (LTS-SP4) 5.10.0-221.0.0.124.oe2203sp3.x86_64 containerd://1.7.20
k8s-node2 Ready 7d21h v1.20.15 172.22.33.212 openEuler 22.03 (LTS-SP4) 5.10.0-221.0.0.124.oe2203sp3.x86_64 containerd://1.7.20
k8s-node3 Ready 6d22h v1.20.15 172.22.33.213 openEuler 22.03 (LTS-SP4) 5.10.0-221.0.0.124.oe2203sp3.x86_64 docker://20.10.18
9、使用 crictl 管理 container 容器
crictl是连接containerd的一个client端工具，用于管理containerd中的容器，这个工具比默认的ctr好用。
默认在安装k8s 集群的时候就已经安装好了 crictl 工具，如果没有安装，可以在到https://github.com/kubernetes-sigs/cri-tools/releases 下载
配置:
crictl 命令有几个子命令和运行时参数。 有关详细信息，请使用 crictl help 或 crictl help 获取帮助信息。
crictl 默认连接到 unix:///var/run/dockershim.sock
- 通过设置参数 --runtime-endpoint 和 --image-endpoint
- 通过设置环境变量 CONTAINER_RUNTIME_ENDPOINT 和 IMAGE_SERVICE_ENDPOINT
- 通过在配置文件中设置端点 --config=/etc/crictl.yaml
vim /etc/crictl.yaml
runtime-endpoint: unix:///var/run/dockershim.sock
image-endpoint: unix:///var/run/dockershim.sock
timeout: 10
使用:
$ crictl ps
CONTAINER IMAGE CREATED STATE NAME ATTEMPT POD ID POD
e1d534d619223 bfe3a36ebd252 28 hours ago Running coredns 0 35129ad6d5b59 coredns-7f89b7bc75-mmz8g
68c316e8d8679 8cc143673c83d 28 hours ago Running calico-node 0 968262a8713b5 calico-node-ptvpq
4d31f61ea23c4 46e2cd1b25948 28 hours ago Running kube-proxy 0 151f51bff3027 kube-proxy-x86hz
38c4d21cdf2df 323f6347f5e23 28 hours ago Running kube-apiserver 0 126d5baa021d9 kube-apiserver-k8s-master
0fc2c1ed4532a d6296d0e06d2d 28 hours ago Running kube-controller-manager 0 8953ba210f01a kube-controller-manager-k8s-master
f3ee929989d55 9155e4deabb35 28 hours ago Running kube-scheduler 0 cef092711df39 kube-scheduler-k8s-master
868271ca8de57 0369cf4303ffd 28 hours ago Running etcd 0 f8c987d6475d5 etcd-k8s-master
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