RKE部署环境准备
RKE是经过CNCF认证的Kubernetes发行版,并且全部组件完全在Docker容器内运行
Rancher Server只能在使用RKE或K3s安装的Kubernetes集群中运行
节点环境准备
1.开放每个节点的端口
给多个窗口：发送同一命令
“查看” —>“撰写” -->“撰写栏 / 撰写窗口”
firewall-cmd --permanent --add-port=22/tcp
firewall-cmd --permanent --add-port=80/tcp
firewall-cmd --permanent --add-port=443/tcp
firewall-cmd --permanent --add-port=30000-32767/tcp
firewall-cmd --permanent --add-port=30000-32767/udp
firewall-cmd --reload
2.同步节点时间
ntpdate time1.aliyun.com
3.安装docker
任何运行Rancher Server的节点上都需要安装Docker
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
sudo yum install docker-ce-18.09.3-3.el7
4.安装kubectl
cat <<EOF > /etc/yum.repos.d/kubernetes.repo [kubernetes] name=Kubernetes baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64 enabled=1 gpgcheck=1 repo_gpgcheck=1 gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg EOF
sudo yum install kubectl
5.安装RKE
Rancher Kubernetes Engine用于构建Kubernetes集群的CLI
https://github.com/rancher/rke/releases/tag/v1.1.3
6.安装Helm
Kubernetes的软件包管理工具
7.配置ssh免密连接
在执行rke up命令的主机上执行创建ssh公私钥 并把公钥分发到各个节点上
ssh-keygen -t rsa
ssh-copy-id 192.168.30.129
ssh-copy-id 192.168.30.133
8.配置操作系统参数支持k8s集群 (所有节点上都要执行)
sudo swapoff -a
sudo vi /etc/sysctl.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
sudo sysctl -p
9.使用rke创建集群初始化配置文件
rke config --name cluster.yml
RKE使用一个名为cluster.yml确定如何在集群中的节点上部署Kubernetes
# If you intened to deploy Kubernetes in an air-gapped environment,
# please consult the documentation on how to configure custom RKE images.
nodes:
- address: "192.168.30.110"
port: "22"
internal_address: ""
role: [controlplane,etcd,worker]
hostname_override: "node1"
user: admin
docker_socket: /var/run/docker.sock
ssh_key: ""
ssh_key_path: ~/.ssh/id_rsa
ssh_cert: ""
ssh_cert_path: ""
labels: {}
taints: []
- address: "192.168.30.129"
port: "22"
internal_address: ""
role: [controlplane,etcd,worker]
hostname_override: "node2"
user: admin
docker_socket: /var/run/docker.sock
ssh_key: ""
ssh_key_path: ~/.ssh/id_rsa
ssh_cert: ""
ssh_cert_path: ""
labels: {}
taints: []
- address: "192.168.30.133"
port: "22"
internal_address: ""
role: [controlplane,etcd,worker]
hostname_override: "node3"
user: admin
docker_socket: /var/run/docker.sock
ssh_key: ""
ssh_key_path: ~/.ssh/id_rsa
ssh_cert: ""
ssh_cert_path: ""
labels: {}
taints: []
services:
etcd:
image: ""
extra_args: {}
extra_binds: []
extra_env: []
external_urls: []
ca_cert: ""
cert: ""
key: ""
path: ""
uid: 0
gid: 0
snapshot: null
retention: ""
creation: ""
backup_config: null
kube-api:
image: ""
extra_args: {}
extra_binds: []
extra_env: []
service_cluster_ip_range: 10.43.0.0/16
service_node_port_range: ""
pod_security_policy: false
always_pull_images: false
secrets_encryption_config: null
audit_log: null
admission_configuration: null
event_rate_limit: null
kube-controller:
image: ""
extra_args: {}
extra_binds: []
extra_env: []
cluster_cidr: 10.42.0.0/16
service_cluster_ip_range: 10.43.0.0/16
scheduler:
image: ""
extra_args: {}
extra_binds: []
extra_env: []
kubelet:
image: ""
extra_args: {}
extra_binds: []
extra_env: []
cluster_domain: cluster.local
infra_container_image: ""
cluster_dns_server: 10.43.0.10
fail_swap_on: false
generate_serving_certificate: false
kubeproxy:
image: ""
extra_args: {}
extra_binds: []
extra_env: []
network:
plugin: flannel
options: {}
mtu: 0
node_selector: {}
update_strategy: null
authentication:
strategy: x509
sans: []
webhook: null
addons: ""
addons_include: []
system_images:
etcd: rancher/coreos-etcd:v3.4.3-rancher1
alpine: rancher/rke-tools:v0.1.58
nginx_proxy: rancher/rke-tools:v0.1.58
cert_downloader: rancher/rke-tools:v0.1.58
kubernetes_services_sidecar: rancher/rke-tools:v0.1.58
kubedns: rancher/k8s-dns-kube-dns:1.15.2
dnsmasq: rancher/k8s-dns-dnsmasq-nanny:1.15.2
kubedns_sidecar: rancher/k8s-dns-sidecar:1.15.2
kubedns_autoscaler: rancher/cluster-proportional-autoscaler:1.7.1
coredns: rancher/coredns-coredns:1.6.9
coredns_autoscaler: rancher/cluster-proportional-autoscaler:1.7.1
nodelocal: rancher/k8s-dns-node-cache:1.15.7
kubernetes: rancher/hyperkube:v1.18.3-rancher2
flannel: rancher/coreos-flannel:v0.12.0
flannel_cni: rancher/flannel-cni:v0.3.0-rancher6
calico_node: rancher/calico-node:v3.13.4
calico_cni: rancher/calico-cni:v3.13.4
calico_controllers: rancher/calico-kube-controllers:v3.13.4
calico_ctl: rancher/calico-ctl:v3.13.4
calico_flexvol: rancher/calico-pod2daemon-flexvol:v3.13.4
canal_node: rancher/calico-node:v3.13.4
canal_cni: rancher/calico-cni:v3.13.4
canal_flannel: rancher/coreos-flannel:v0.12.0
canal_flexvol: rancher/calico-pod2daemon-flexvol:v3.13.4
weave_node: weaveworks/weave-kube:2.6.4
weave_cni: weaveworks/weave-npc:2.6.4
pod_infra_container: rancher/pause:3.1
ingress: rancher/nginx-ingress-controller:nginx-0.32.0-rancher1
ingress_backend: rancher/nginx-ingress-controller-defaultbackend:1.5-rancher1
metrics_server: rancher/metrics-server:v0.3.6
windows_pod_infra_container: rancher/kubelet-pause:v0.1.4
ssh_key_path: ~/.ssh/id_rsa
ssh_cert_path: ""
ssh_agent_auth: false
authorization:
mode: rbac
options: {}
ignore_docker_version: null
kubernetes_version: ""
private_registries: []
ingress:
provider: ""
options: {}
node_selector: {}
extra_args: {}
dns_policy: ""
extra_envs: []
extra_volumes: []
extra_volume_mounts: []
update_strategy: null
cluster_name: ""
cloud_provider:
name: ""
prefix_path: ""
addon_job_timeout: 0
bastion_host:
address: ""
port: ""
user: ""
ssh_key: ""
ssh_key_path: ""
ssh_cert: ""
ssh_cert_path: ""
monitoring:
provider: ""
options: {}
node_selector: {}
update_strategy: null
replicas: null
restore:
restore: false
snapshot_name: ""
dns: null
export KUBECONFIG=/home/admin/kube_config_cluster.yml
mkdir ~/.kube
cp kube_config_rancher-cluster.yml ~/.kube/config
通过RKE安装k8s集群成功,启动的时候有些节点启动的比较慢。需要稍微等待一段时间.
在创建的k8s集群上安装Rancher
重启一个Pod的命令就是把这个Pod直接删除掉
RKE的环境清理
rancher-node-1,2,3中分别执行以下命令
mkdir rancher cat > rancher/clear.sh << EOF df -h|grep kubelet |awk -F % '{print $2}'|xargs umount rm /var/lib/kubelet/* -rf rm /etc/kubernetes/* -rf rm /var/lib/rancher/* -rf rm /var/lib/etcd/* -rf rm /var/lib/cni/* -rf rm -rf /var/run/calico iptables -F && iptables -t nat -F ip link del flannel.1 docker ps -a|awk '{print $1}'|xargs docker rm -f docker volume ls|awk '{print $2}'|xargs docker volume rm rm -rf /var/etcd/ rm -rf /run/kubernetes/ docker rm -fv $(docker ps -aq) docker volume rm $(docker volume ls) rm -rf /etc/cni rm -rf /opt/cni systemctl restart docker EOF sh rancher/clear.sh
清理残留目录结束。如果还有问题可能需要卸载所有节点上的docker
首先查看Docker版本 # yum list installed | grep docker docker-ce.x86_64 18.05.0.ce-3.el7.centos @docker-ce-edge 执行卸载 # yum -y remove docker-ce.x86_64 删除存储目录 # rm -rf /etc/docker # rm -rf /run/docker # rm -rf /var/lib/dockershim # rm -rf /var/lib/docker 如果发现删除不掉，需要先 umount，如 # umount /var/lib/docker/devicemapper
rke up --config=./rancher-cluster.yml rke启动执行是幂等操作的 有时候需要多次执行才能成功
多次执行启动后
rke多次安装和卸载k8s集群问题
1.启动的时候提示ectd的集群健康检查失败
清空节点上所有k8s的相关目录。卸载和删除docker所有相关目录。重新安装docker
最后在执行rke启动命令