1 前言

一个问题，一篇文章，一出故事。
笔者想要通过Base Shell获取Elasticsearch集群的状态，于是创建此脚本。

2 最佳实践

2.1 环境信息

如果你需要参考我们的环境，请参阅如下章节，

如何部署带安全认证的Elasticsearch 8.x集群？

2.2 安装所需的软件包

dnf install -y bc

2.3 创建获取脚本

mkdir ~/scripts/
vim ~/scripts/getElasticSearchStatus.sh

加入如下配置，

#!/bin/bash

esHost="http://azelasticsearch01:9200"
esUser="elastic"
esPasswd="elasticpwd"

getClusterHealth() {
  clusterStatus=$(curl -u $esUser:$esPasswd -s "$esHost/_cluster/health" | jq -r '.status')
  echo "Cluster Status: $clusterStatus"
}

getClusterDiskUsage() {
  diskTotal=$(curl -u $esUser:$esPasswd -s "$esHost/_cluster/stats" | jq -r '.nodes.fs.total_in_bytes')
  diskFree=$(curl -u $esUser:$esPasswd -s "$esHost/_cluster/stats" | jq -r '.nodes.fs.free_in_bytes')
  diskAvailable=$(curl -u $esUser:$esPasswd -s "$esHost/_cluster/stats" | jq -r '.nodes.fs.available_in_bytes')
  diskUsage=$(echo "scale=2; ($diskTotal - $diskFree) / $diskTotal * 100" | bc)
  echo "Cluster Disk Usage: $diskUsage%"
}

getClusterMemoryUsage() {
  memTotal=$(curl -u $esUser:$esPasswd -s "$esHost/_cluster/stats" | jq -r '.nodes.jvm.mem.heap_max_in_bytes')
  memUsed=$(curl -u $esUser:$esPasswd -s "$esHost/_cluster/stats" | jq -r '.nodes.jvm.mem.heap_used_in_bytes')
  memUsage=$(echo "scale=2; $memUsed / $memTotal * 100" | bc)
  echo "Cluster Mem Usage: $memUsage%"
}

getClusterCpuUsage() {
  cpuUsage=$(curl -u $esUser:$esPasswd -s "$esHost/_cluster/stats" | jq -r '.nodes.process.cpu.percent')
  echo "Cluster CPU Usage: $cpuUsage%"
}

getNodeDiskUsage() {
  curl -u $esUser:$esPasswd -s "$esHost/_cat/allocation?pretty" | awk -F ' ' '{print "Disk Usage "$12": "$9"%"}'
}

getNodeMemoryUsage() {
  curl -u $esUser:$esPasswd -s "$esHost/_cat/nodes?pretty" | awk -F ' ' '{print "Memory Usage "$10": "$2"%"}'
}

getNodeCpuUsage() {
  curl -u $esUser:$esPasswd -s "$esHost/_cat/nodes?pretty" | awk -F ' ' '{print "CPU Usage"$10": "$4"%"}'
}

getClusterHealth
getClusterDiskUsage
getClusterMemoryUsage
getClusterCpuUsage
getNodeDiskUsage
getNodeMemoryUsage
getNodeCpuUsage

2.4 测试脚本

sh ~/scripts/getElasticSearchStatus.sh

可见如下输出，

Cluster Status: green
Cluster Disk Usage: 12.00%
Cluster Mem Usage: 37.00%
Cluster CPU Usage: 4%
Disk Usage azelasticsearch03: 12%
Disk Usage azelasticsearch02: 12%
Disk Usage azelasticsearch04: 12%
Disk Usage azelasticsearch05: 12%
Disk Usage azelasticsearch01: 13%
Memory Usage azelasticsearch03: 44%
Memory Usage azelasticsearch01: 14%
Memory Usage azelasticsearch04: 48%
Memory Usage azelasticsearch05: 32%
Memory Usage azelasticsearch02: 47%
CPU Usageazelasticsearch03: 0%
CPU Usageazelasticsearch01: 2%
CPU Usageazelasticsearch04: 0%
CPU Usageazelasticsearch05: 1%
CPU Usageazelasticsearch02: 1%