elasticsearch启动常见错误

elasticsearch启动常见错误

错误一

错误内容：

max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]

每个进程最大同时打开文件数太小，可通过下面2个命令查看当前数量：

ulimit -Hu
ulimit -Su

修改/etc/security/limits.conf文件，增加配置，用户退出后重新登录生效：

vim /etc/security/limits.conf

增加配置:

es soft nofile 65535
es hard nofile 65537

错误二

错误内容：

max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

修改/etc/sysctl.conf文件，增加配置vm.max_map_count=262144

vi /etc/sysctl.conf

使修改的sysctl.conf文件生效的命令：

sysctl -p

错误三

错误内容：

Exception in thread "main" java.nio.file.AccessDeniedException: /usr/local/elasticsearch/elasticsearch-6.2.2-1/config/jvm.options

elasticsearch用户没有该文件夹的权限，执行命令：

chown es /home/skywalking/elasticsearch-7.13.3 -R

错误四

错误内容：

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

修改elasticsearch.yml配置文件,将#cluster.initial_master_nodes: [“node-1”, “node-2”]配置文件中的注释去掉：

cluster.initial_master_nodes: ["node-1", "node-2"]

错误五

错误内容：

java.lang.IllegalStateException: failed to obtain node locks,tried...

在elasticsearch.yml配置文件最后加入node.max_local_storage_nodes: 2

node.max_local_storage_nodes: 2

上述问题绝大多数是由于在elasticsearch.yml配置文件中添加network.host: 0.0.0.0造成的。