Elasticsearch启动常见问题   文件夹赋予用户权限 [root@chenxi elasticsearch]# chown -R eschenxi:esgroup /chenxi/software/elasticsearch #"/chenxi/software/elasticsearch" 为安装目录 错误信息：max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144] ERROR: [1] bootstrap checks failed [1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144] ERROR: Elasticsearch did not exit normally - check the logs at /chenxi/software/elasticsearch/logs/elasticsearch.log   解决办法： [root@chenxi elasticsearch]# vim /etc/sysctl.conf 在文件末尾追加：vm.max_map_count=655360 保存后执行 [root@chenxi elasticsearch]# sysctl -p 错误信息： [1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535] ERROR: [5] bootstrap checks failed [1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535] [2]: max number of threads [1024] for user [es] is too low, increase to at least [4096] [3]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144] [4]:  failed to install; check the logs and fix your configuration or disable system call filters at your own risk [5]: the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts, discovery.seed_providers, cluster.initial_master_nodes] must be configured     解决办法： [root@chenxi elasticsearch]# vim /etc/security/limits.conf ## 65535修改为65536 * soft nofile 65536 * hard nofile 65536 ## 文件末尾追加 * soft nproc 4096 * hard nproc 4096 修改文件后保存并“关闭会话，重新登陆服务器”   错误信息：system call filters failed to install; check the logs and fix your configuration or disable system call filters at your own risk ERROR: [2] bootstrap checks failed [1]: system call filters failed to install; check the logs and fix your configuration or disable system call filters at your own risk [2]: the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts, discovery.seed_providers, cluster.initial_master_nodes] must be configured   解决办法： ##在elasticsearch.yml修改并添加配置项 [root@chenxi elasticsearch]# vim config/elasticsearch.yml # ----------------------------------- Memory ----------------------------------- # # Lock the memory on startup: # 取消注释并设置值为false bootstrap.memory_lock: false # 追加配置项 bootstrap.system_call_filter: false   错误信息： the default discovery settings are unsuitable for production use; at least one of ERROR: [1] bootstrap checks failed [1]: the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts, discovery.seed_providers, cluster.initial_master_nodes] must be configured   解决办法： ##在elasticsearch.yml添加配置项 [root@chenxi elasticsearch]# vim config/elasticsearch.yml   # --------------------------------- Discovery ---------------------------------- # # Pass an initial list of hosts to perform discovery when this node is started: # The default list of hosts is ["127.0.0.1", "[::1]"] # #discovery.seed_hosts: ["host1", "host2"] # # Bootstrap the cluster using an initial set of master-eligible nodes: # 取消注释，并保留一个节点 cluster.initial_master_nodes: ["node-1"]   测试Es启动是否正常： http://IP:9092 {      "name" : "chenxi",      "cluster_name" : "elasticsearch",      "cluster_uuid" : "_na_",      "version" : {                "number" : "7.6.0",                 "build_flavor" : "default",                 "build_type" : "tar",                 "build_hash" : "7f634e9f44834fbc12724506cc1da681b0c3b1e3",                 "build_date" : "2020-02-06T00:09:00.449973Z",                 "build_snapshot" : false, "lucene_version" : "8.4.0",                 "minimum_wire_compatibility_version" : "6.8.0",                "minimum_index_compatibility_version" : "6.0.0-beta1"      },      "tagline" : "You Know, for Search" }