etcd集群安装卸载.md

集群安装脚本

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# 函数：创建必要的目录结构
create_directories() {
	mkdir -p "$@"
}

# 创建etcd配置文件
create_etcd_config() {
  local config_file=$1
  local node_name=$2
  local data_dir=$3
  local wal_dir=$4
  local client_url=$5
  local peer_url=$6
	local cluster_token=$7
	local cluster=$8
	local new_opt=${9}
  
  cat << EOF > "$config_file"
ETCD_OPTS="--name $node_name \\
--max-request-bytes 10485760 \\
--data-dir $data_dir \\
--wal-dir $wal_dir \\
--advertise-client-urls $client_url \\
--listen-client-urls $client_url \\
--listen-peer-urls $peer_url \\
--initial-advertise-peer-urls $peer_url \\
--initial-cluster-token ${cluster_token} \\
--initial-cluster ${cluster} \\
--initial-cluster-state ${new_opt}"
EOF
}

reload_and_start_etcd() {
  systemctl daemon-reload
  systemctl start etcd
}

# 函数：配置并启动etcd服务
create_etcd_service() {
  local service_file=$1
  local config_path=$2
  local etcd_executable=$3
  
  cat << EOF > "$service_file"
[Unit]
Description=Etcd For Kubernetes
Wants=network-online.target
After=network.target network-online.target

[Service]
EnvironmentFile=$config_path
ExecStart=$etcd_executable \$ETCD_OPTS
Restart=always

[Install]
WantedBy=multi-user.target
EOF
}

get_etcd_from_local() {
  local source_path=$1
  local target_dir=$2

  if [ ! -f "$source_path" ]; then
    echo "Source etcd binary does not exist at ${source_path}."
    exit 1
  fi

  echo "Copying etcd binary from ${source_path} to ${target_dir}..."
  if cp "$source_path" "${target_dir}/etcd"; then
    chmod +x "${target_dir}/etcd"
    echo "Successfully copied and prepared etcd binary."
  else
    echo "Failed to copy etcd binary from ${source_path}."
    exit 1
  fi
}

get_etcd_from_remote() {
  local bin_dir=$1
  local ftpserver=$2
  local http_user=$3
  local http_passwd=$4

  echo "Downloading etcd binary from ${ftpserver}..."
  if wget -P "$bin_dir" --http-user="$http_user" --http-passwd="$http_passwd" "${ftpserver}/repo/kubernetes/etcd"; then
    chmod +x "${bin_dir}/etcd"
    echo "Successfully downloaded and prepared etcd binary."
  else
    echo "Failed to download etcd binary from ${ftpserver}."
    exit 1
  fi
}

get_etcd() {
  local option=$1
  local target_dir=$2
  local source_path_or_url=$3
  local http_user=$4 # 仅 remote 时需要
  local http_passwd=$5 # 仅 remote 时需要

  case "$option" in
    "local")
      get_etcd_from_local "$source_path_or_url" "$target_dir"
      ;;
    "remote")
      get_etcd_from_remote "$target_dir" "$source_path_or_url" "$http_user" "$http_passwd"
      ;;
    *)
      echo "Invalid option: $option. Please choose 'local' or 'remote'."
      exit 1
      ;;
  esac
}

list_etcd_members() {
  local server_url=$1

  # todo --user --cert --key 
  curl -X POST "${server_url}/v3/cluster/member/list" \
    -H "Content-Type: application/json" \
    -d '{}'
}

add_etcd_member_by_curl() {
  local server_url=$1
  local peer_url=$2

  # 构造请求体
  local data=$(cat <<EOF
{
  "peerURLs": ["$peer_url"]
}
EOF
)

  # 发送请求
  curl -X POST "${server_url}/v3/cluster/member/add" \
       -H "Content-Type: application/json" \
       -d "$data"
}


# 主函数：安装etcd集群节点
install_etcd_cluster_node() {
  local node_name=$1
  local node_ip=$2
  local cluster_ips=$3
	local new_opt=$4

  local data_dir="/opt/k8s/data"
  local wal_dir="/opt/k8s/wal"
  local bin_dir="/opt/k8s/bin"
  local work_dir="/opt/k8s/work"
  local ftpserver="http://119.91.145.27:12800"
  local http_user="team"
  local http_passwd="xdmybl"
  local config_file="${work_dir}/etcd.conf"
  local service_file="/lib/systemd/system/etcd.service"
  local etcd_executable="${bin_dir}/etcd"
	local etcd_src_path="/opt/etcd"
	local cluster_gs="cluster_token1"

	local client_url="http://${node_ip}:2379"
	local listen_peer_url="http://${node_ip}:2380"

  # 创建所需目录
  create_directories "$data_dir" "$wal_dir" "$bin_dir" "$work_dir"

  create_etcd_config "$config_file" "$node_name" "$data_dir" "$wal_dir" "$client_url" "${listen_peer_url}" "${cluster_gs}" "${cluster_ips}" ${new_opt}
	
  create_etcd_service "$service_file" "$config_file" "$etcd_executable"	
  # 下载etcd二进制文件
	get_etcd "local" "$bin_dir" "$etcd_src_path"
  reload_and_start_etcd
  # 配置并启动etcd服务
}

extract_hosts_to_cluster_info() {
                local hosts_file=$1
                local cluster_info=$(awk '/^\s*[^#]/ && $2 ~ /.srhino.svc.local$/ && $2 !~ /^s/ && $2 !~ /^localhost/ {sub(/\.srhino\.svc\.local$/, "", $2); print $2"=http://"$1":2380"}' ${hosts_file} | paste -sd,)
                echo $cluster_info
}

安装三节点（建立三节点），适用于创建集群时，直接声明集群三节点

时序图

sequenceDiagram
    participant Manager as Manager
    participant Node1 as node1
    participant Node2 as node2
    participant Node3 as node3

    par 建立新集群
        Manager->>Node1: new cluster: node1, node2, node3
        Manager->>Node2: new cluster: node1, node2, node3
        Manager->>Node3: new cluster: node1, node2, node3
    and 相应节点响应
        Node1-->>Manager: 响应
        Node2-->>Manager: 响应
        Node3-->>Manager: 响应
    end
    Note over Manager,Node3: etcd 初始集群建立完成



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#!/bin/bash

# 并发执行三节点安装
ssh -n root@192.168.122.26 "cd /opt && ./install_cluster.sh" &
ssh -n root@192.168.122.35 "cd /opt && ./install_cluster.sh" &
ssh -n root@192.168.122.238 "cd /opt && ./install_cluster.sh" &

wait
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#!/bin/bash

source ./install_cluster_lib.sh 
# first node param
#local_ip="ouryun.node2.com"
local_ip="192.168.122.26"
local_host="node1"
# 三节点都需要是 new
new_opt="new"
# 这里包含集群信息
cluster_info="node1=http://192.168.122.26:2380,node2=http://192.168.122.35:2380,node3=http://192.168.122.237:2380"

# 使用示例
# install_etcd_cluster_node "node1" "192.168.1.1" "node1=http://192.168.1.1:2380,node2=http://192.168.1.2:2380,node3=http://192.168.1.3:2380"
install_etcd_cluster_node $local_host $local_ip "${cluster_info}"  ${new_opt}

安装三节点（先创建一个节点的集群，再加入 node2 ，再加入 node3），适用于往已有集群加入新节点

时序图

sequenceDiagram
	participant manager as Manager
    participant Node1 as node1
    participant Node2 as node2
    participant Node3 as node3


	manager->>Node1: 建立集群
	activate Node1
    Node1->>Node1: new cluster node1
    Node1-->>manager: 
    deactivate Node1
    
    manager->>Node2: 新增节点2
    activate Node2
    Note over Node1,Node2: 环境变量中 cluster: node1,node2
    Node2->>Node1: member add node2
    Node1-->>Node2: 
    Node2->>Node2: node2 start （existing cluster, cluster: node1,node2）
    Node2-->>manager: 
    deactivate Node2
    
    manager->>Node3: 新增节点3
    activate Node3
    Note over Node1,Node3: 环境变量中 cluster: node1,node2,node3
    alt request endpoints
    	Node3->>Node1: member add node3
    	Node1-->>Node3: 
    else
    	Node3->>Node2: member add node3
    	Node2-->>Node3: 
    end
    Node3->>Node3: node3 start（existing cluster, cluster: node1,node2,node3）
    Node3-->>manager: 响应
	deactivate Node3

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# install_etcd_first.sh
#!/bin/bash

source ./install_cluster_lib.sh 
# first node param
local_ip="192.168.122.26"
local_host="node1"
new_opt="new"
# 这里包含集群信息
existing_node_info=""

# 使用示例
# install_etcd_cluster_node "node1" "192.168.1.1" "node1=http://192.168.1.1:2380,node2=http://192.168.1.2:2380,node3=http://192.168.1.3:2380"

install_etcd_cluster_node $local_host $local_ip "${local_host}=http://${local_ip}:2380" ${new_opt}
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# install_etcd_other.sh

# other node param

source ./install_cluster_lib.sh 

local_ip="192.168.122.35"
local_host="node2"
new_opt="existing"
existing_node_info="node1=http://192.168.122.26:2380"

# 使用示例
# install_etcd_cluster_node "node1" "192.168.1.1" "node1=http://192.168.1.1:2380,node2=http://192.168.1.2:2380,node3=http://192.168.1.3:2380"
install_etcd_cluster_node $local_host $local_ip "${existing_node_info},${local_host}=http://${local_ip}:2380" ${new_opt}

新增集群节点

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# member_add_by_etcdctl.sh
# 新增集群
member_add_by_etcdctl() {
  local new_member_name=$1
  local new_member_peer_url=$2
  local existing_member_client_urls=$3

  # 设置ETCDCTL_API版本，确保使用v3 API
  export ETCDCTL_API=3

  # 添加新成员到集群
  etcdctl --endpoints="${existing_member_client_urls}" \
    member add "${new_member_name}" \
    --peer-urls="${new_member_peer_url}"

  # 检查命令执行的退出状态
  if [ $? -eq 0 ]; then
    echo "Member ${new_member_name} successfully added to the cluster."
  else
    echo "Failed to add member ${new_member_name} to the cluster."
    exit 1
  fi
}

# member_id="node2"
# member_url="http://192.168.122.35:2380"
# access_endpoint_url="http://192.168.122.26:2379"

# # 新增集群成员
# member_add "node2" "http://192.168.122.35:2380" "http://192.168.122.26:2379"
member_id="node3"
member_url="http://192.168.122.237:2380"
access_endpoint_url="http://192.168.122.26:2379"

# 新增集群成员
member_add_by_etcdctl ${member_id} ${member_url} ${access_endpoint_url}

卸载 etcd

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# uninstall_etcd.sh

#!/bin/bash

# 停止etcd服务
stop_etcd_service() {
  echo "Stopping etcd service..."
  systemctl stop etcd
}

# 禁用etcd服务
disable_etcd_service() {
  echo "Disabling etcd service..."
  systemctl disable etcd
}

# 删除etcd服务文件
remove_etcd_service_file() {
  echo "Removing etcd service file..."
  rm -f /lib/systemd/system/etcd.service
}

# 重新加载systemd守护进程
reload_systemd() {
  echo "Reloading systemd daemon..."
  systemctl daemon-reload
}

# 删除etcd二进制文件和数据目录
cleanup_etcd_files() {
  local bin_dir="/opt/k8s/bin"
  local data_dir="/opt/k8s/data"
  local wal_dir="/opt/k8s/wal"
  local work_dir="/opt/k8s/work"

  echo "Cleaning up etcd binary and data directories..."
  rm -f "${bin_dir}/etcd"
  rm -rf "$data_dir"
  rm -rf "$wal_dir"
  rm -rf "$work_dir"
}

# 卸载etcd的主函数
uninstall_etcd() {
  stop_etcd_service
  disable_etcd_service
  remove_etcd_service_file
  reload_systemd
  cleanup_etcd_files
  
  echo "etcd has been successfully uninstalled."
}

# 执行卸载
uninstall_etcd

domain > k8s
#etcd #cluster
etcd集群安装卸载.md
https://abrance.github.io/2024/03/27/domain/k8s/etcd集群安装卸载/
Author
xiaoy
Posted on
March 27, 2024
Licensed under