linux查看es状态

要查看Elasticsearch（ES）的状态，您可以使用以下命令：

systemctl status elasticsearch

如果ES正在运行，您将看到以下输出：

● elasticsearch.service - Elasticsearch
   Loaded: loaded (/usr/lib/systemd/system/elasticsearch.service; enabled; vendor preset: enabled)
   Active: active (running) since Fri 2021-08-20 09:25:50 UTC; 2min 30s ago
     Docs: http://www.elastic.co
 Main PID: 1118 (java)
    Tasks: 47 (limit: 1153)
   Memory: 1.6G
   CGroup: /system.slice/elasticsearch.service
           ├─1118 /usr/share/elasticsearch/jdk/bin/java -Des.networkaddress.cache.ttl=60 -Des.networkaddress.cache.negative.ttl=10 -XX:+AlwaysPreTouch -Xss1m -Djava.awt.headless=true -Dfile.encoding=UTF-8 -Djna.nosys=true -XX:-OmitStac...
           ├─1324 /usr/share/elasticsearch/modules/x-pack-ml/platform/linux-x86_64/bin/controller
           └─1407 /usr/share/elasticsearch/modules/x-pack-ml/platform/linux-x86_64/bin/controller

如果ES没有运行，您将看到以下输出：

● elasticsearch.service - Elasticsearch
   Loaded: loaded (/usr/lib/systemd/system/elasticsearch.service; enabled; vendor preset: enabled)
   Active: inactive (dead) since Fri 2021-08-20 09:24:38 UTC; 3min 58s ago
     Docs: http://www.elastic.co
  Process: 1002 ExecStart=/usr/share/elasticsearch/bin/elasticsearch -p ${PID_DIR}/elasticsearch.pid --quiet (code=exited, status=1/FAILURE)
 Main PID: 1002 (code=exited, status=1/FAILURE)