centos上安装elasticsearch 5.5.1 遇到的各种坑

mac玩得好好滴，一次性启动成功，结果在centos上安装时，遇坑无数，记录一下：

一、只能localhost访问的问题
修改 conf\elasticsearch.yml

network.host: 0.0.0.0
http.port: 9200
discovery.zen.ping.unicast.hosts: ["0.0.0.0"]

二、各种启动 ... too low 的妖娥子

比如：
max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]
max number of threads [1024] for user [lishang] likely too low, increase to at least [2048]
max number of threads [1024] for user [elasticsearch] is too low, increase to at least [2048]

2.1 修改/etc/security/limits.conf

# /etc/security/limits.conf
* soft nofile 65536
* hard nofile 131072
* soft nproc 2048
* hard nproc 4096

2.2 修改 /etc/security/limits.d/90-nproc.conf

* soft nproc 2048
root soft nproc unlimited
deploy soft nproc unlimited

2.3 修改/etc/sysctl.conf

追加(如果已存在，则直接修改)

vm.max_map_count=262144

然后执行sysctl -p

三、启动中的 bootstrap checks failed

仍然修改 conf\elasticsearch.yml

bootstrap.memory_lock: false
bootstrap.system_call_filter: false