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 -Hn
ulimit -Sn
# 修改/etc/security/limits.conf文件，增加配置，用户退出后重新登录生效
*               soft    nofile          65536
*               hard    nofile          65536

max number of threads [3818] for user [es] is too low, increase to at least [4096]

# 最大线程个数太低。可通过命令查看
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
*               soft    nproc           4096
*               hard    nproc           4096

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
# 编辑
vim /etc/sysctl.conf
# 配置
vm.max_map_count=262144
# 生效
sysctl -p

[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 config/elasticsearch.yml 取消注释保留一个节点即可
cluster.initial_master_nodes: ["node-1"]

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

# ElasticSearch 不支持使用 root 权限运行，需要创建一个用户并授权 ES 目录给这个用户
# 添加用户
useradd elk
# 给用户设置密码
passwd elk
# 更改目录所有者
chown -R elk /usr/local/apps/es/
# 目录下文件权限配置
chmod -R 755 /usr/local/apps/es/
# 切换 elk 用户
su elk
# 执行 bin/elasticsearch 即可
./bin/elasticsearch

本地通过ip:9200访问不到elasticsearch服务

# 修改 config/elasticsearch.yml 
network.host: 0.0.0.0