mirror of https://github.com/easzlab/kubeasz.git
115 lines
4.1 KiB
Markdown
115 lines
4.1 KiB
Markdown
## 05-安装kube_node节点
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`kube_node` 是集群中运行工作负载的节点，前置条件需要先部署好`kube_master`节点，它需要部署如下组件：
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``` bash
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cat playbooks/05.kube-node.yml
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- hosts: kube_node
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roles:
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- { role: kube-lb, when: "inventory_hostname not in groups['kube_master']" }
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- { role: kube-node, when: "inventory_hostname not in groups['kube_master']" }
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```
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+ kube-lb：由nginx裁剪编译的四层负载均衡，用于将请求转发到主节点的 apiserver服务
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+ kubelet：kube_node上最主要的组件
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+ kube-proxy： 发布应用服务与负载均衡
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### 创建cni 基础网络插件配置文件
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因为后续需要用 `DaemonSet Pod`方式运行k8s网络插件，所以kubelet.server服务必须开启cni相关参数，并且提供cni网络配置文件
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### 创建 kubelet 的服务文件
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+ 根据官方建议独立使用 kubelet 配置文件，详见roles/kube-node/templates/kubelet-config.yaml.j2
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+ 必须先创建工作目录 `/var/lib/kubelet`
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``` bash
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[Unit]
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Description=Kubernetes Kubelet
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Documentation=https://github.com/GoogleCloudPlatform/kubernetes
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[Service]
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WorkingDirectory=/var/lib/kubelet
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ExecStartPre=/bin/mount -o remount,rw '/sys/fs/cgroup'
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{% if KUBE_RESERVED_ENABLED == "yes" or SYS_RESERVED_ENABLED == "yes" %}
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ExecStartPre=/bin/mkdir -p /sys/fs/cgroup/cpu/podruntime.slice
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ExecStartPre=/bin/mkdir -p /sys/fs/cgroup/cpuacct/podruntime.slice
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ExecStartPre=/bin/mkdir -p /sys/fs/cgroup/cpuset/podruntime.slice
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ExecStartPre=/bin/mkdir -p /sys/fs/cgroup/memory/podruntime.slice
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ExecStartPre=/bin/mkdir -p /sys/fs/cgroup/pids/podruntime.slice
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ExecStartPre=/bin/mkdir -p /sys/fs/cgroup/systemd/podruntime.slice
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ExecStartPre=/bin/mkdir -p /sys/fs/cgroup/cpu/system.slice
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ExecStartPre=/bin/mkdir -p /sys/fs/cgroup/cpuacct/system.slice
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ExecStartPre=/bin/mkdir -p /sys/fs/cgroup/cpuset/system.slice
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ExecStartPre=/bin/mkdir -p /sys/fs/cgroup/memory/system.slice
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ExecStartPre=/bin/mkdir -p /sys/fs/cgroup/pids/system.slice
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ExecStartPre=/bin/mkdir -p /sys/fs/cgroup/systemd/system.slice
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ExecStartPre=/bin/mkdir -p /sys/fs/cgroup/hugetlb/podruntime.slice
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ExecStartPre=/bin/mkdir -p /sys/fs/cgroup/hugetlb/system.slice
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{% endif %}
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ExecStart={{ bin_dir }}/kubelet \
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--config=/var/lib/kubelet/config.yaml \
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--container-runtime-endpoint=unix:///run/containerd/containerd.sock \
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--hostname-override={{ K8S_NODENAME }} \
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--kubeconfig=/etc/kubernetes/kubelet.kubeconfig \
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--root-dir={{ KUBELET_ROOT_DIR }} \
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--v=2
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Restart=always
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RestartSec=5
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[Install]
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WantedBy=multi-user.target
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```
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+ --ExecStartPre=/bin/mkdir -p xxx 对于某些系统（centos7）cpuset和hugetlb 是默认没有初始化system.slice 的，需要手动创建，否则在启用--kube-reserved-cgroup 时会报错Failed to start ContainerManager Failed to enforce System Reserved Cgroup Limits
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+ 关于kubelet资源预留相关配置请参考 https://kubernetes.io/docs/tasks/administer-cluster/reserve-compute-resources/
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### 创建 kube-proxy kubeconfig 文件
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该步骤已经在 deploy节点完成，[roles/deploy/tasks/main.yml](../../roles/deploy/tasks/main.yml)
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+ 生成的kube-proxy.kubeconfig 配置文件需要移动到/etc/kubernetes/目录，后续kube-proxy服务启动参数里面需要指定
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### 创建 kube-proxy服务文件
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``` bash
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[Unit]
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Description=Kubernetes Kube-Proxy Server
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Documentation=https://github.com/GoogleCloudPlatform/kubernetes
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After=network.target
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[Service]
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WorkingDirectory=/var/lib/kube-proxy
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ExecStart={{ bin_dir }}/kube-proxy \
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--config=/var/lib/kube-proxy/kube-proxy-config.yaml
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Restart=always
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RestartSec=5
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LimitNOFILE=65536
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[Install]
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WantedBy=multi-user.target
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```
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请注意 [kube-proxy-config](../../roles/kube-node/templates/kube-proxy-config.yaml.j2) 文件的注释说明
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### 验证 node 状态
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``` bash
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systemctl status kubelet # 查看状态
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systemctl status kube-proxy
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journalctl -u kubelet # 查看日志
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journalctl -u kube-proxy
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```
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运行 `kubectl get node` 可以看到类似
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``` bash
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NAME STATUS ROLES AGE VERSION
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192.168.1.42 Ready <none> 2d v1.9.0
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192.168.1.43 Ready <none> 2d v1.9.0
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192.168.1.44 Ready <none> 2d v1.9.0
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```
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[后一篇](06-install_network_plugin.md)
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