elasticsearch踩坑

问题一

max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
配置 /etc/sysctl.conf

1 2	$ vi /etc/sysctl.conf vm.max_map_count=262144

生效

1	$ sysctl -p

验证

1	$ sysctl -a\|grep vm.max_map_count

问题二

max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]
max number of threads [1024] for user [XXX] is too low，increase to least [2048]
1、修改 nofile 时候，需要在 /etc/sysctl.conf 和 /etc/security/limits.conf 配置，其中 /etc/sysctl.conf 中配置的值需要比 /etc/security/limits.conf 的值大。

配置 /etc/sysctl.conf

1 2	$ vi /etc/sysctl.conf fs.file-max = 512000

生效

1	$ sysctl -p

配置 /etc/security/limits.conf

1 2	$ vi /etc/security/limits.conf elasticsearch - nofile 65536

或者

1	* - nofile 65536

2、修改 nofile 和 nproc
CentOS 7 的 nproc 的修改在 /etc/security/limits.d/20-nproc.conf，为了方便在 /etc/security/limits.conf 和 /etc/security/limits.d/20-nproc.conf 文件里面同时都添加了。

配置 /etc/security/limits.conf

1 2	$ vi /etc/security/limits.conf * - nproc 65536

配置 /etc/security/limits.d/20-nproc.conf

1
2
3

$ vi /etc/security/limits.d/20-nproc.conf
* - nofile 65536
* - nproc 65536

重启系统，验证

1	$ ulimit -Hn

总结：

$ vi /etc/sysctl.conf
vm.max_map_count=262144
fs.file-max=512000

$ vi /etc/security/limits.conf
elasticsearch - nofile 65536
* - nproc 65536

$ vi /etc/security/limits.d/20-nproc.conf
* - nofile 65536
* - nproc 65536