ubuntu部署elasticsearch

注：需要用非root账号启动
1.下载安装包：elasticsearch-5.5.1.zip
解压：
unzip elasticsearch-5.5.1.zip

注：启动elasticsearch时可用内存必须大于2G，否则无法启动。

2.修改内存大小
修改elasticsearch-5.5.1/config/jvm.options
-Xms1g
-Xmx1g

3.修改外网访问
conf/elasticsearch.yml
network.host: 0.0.0.0

3.启动
nohup ./bin/elasticsearch &

访问：http://localhost:9200

报错1.OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000085330000, 2060255232, 0) failed; error=‘Cannot allocate memory’ (errno=12)

修改elasticsearch-5.5.1/config/jvm.options
-Xms1g
-Xmx1g
将内存改为1g(由于我的阿里云机器只有2G内存,所以会启动报错)

报错2.
ERROR: [2] bootstrap checks failed
[1]: max file descriptors [65535] for elasticsearch process is too low, increase to at least [65536]
[2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

a.修改文件 /etc/security/limits.conf

work soft nofile 131072
work hard nofile 131072
work soft nproc 2048
work hard nproc 4096
注：work为启动用户

b.修改/etc/sysctl.conf
vm.max_map_count=655360
执行命令：sysctl -p