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+一、调整内存：max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]（elasticsearch用户拥有的内存权限太小，至少需要262144）
+
+## 修改配置sysctl.conf
+[root@localhost ~]# vi /etc/sysctl.conf
+## 添加下面配置：
+vm.max_map_count=262144
+## 重新加载：
+[root@localhost ~]# sysctl -p
+## 最后重新启动elasticsearch，即可启动成功。
+
+
+二、Docker 命令自动补全
+## 安装依赖工具bash-complete
+[root@localhost ~]# yum install -y bash-completion
+[root@localhost ~]# source /usr/share/bash-completion/completions/docker
+[root@localhost ~]# source /usr/share/bash-completion/bash_completion
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