couchbase是一个较新的、发展迅速的nosql数据库技术。2014年，viber宣布使用couchbase替换mongodb，以适应10亿级的用户量，目前，couchbase已大量运用于生产环境，国内使用的公司主要有新浪，腾讯等。由于中文资料较少，阅读了官方文档中的部分介绍后，将资料翻译和汇总如下。
couchbase是CouchDB和MemBase的合并。而memBase是基于Memcached的。因此couchbase联合了couchbase的简单可靠和memcached的高性能，以及membase的可扩展性。
couchbase可用于单机环境，也可以和其他服务器一起提供分布式的数据存储。
一、安装couchbase（node1、node2、node3）
1、关闭防火墙和selinux
[root@localhost ~]# systemctl stop firewalld
[root@localhost ~]# systemctl disable firewalld
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
Removed symlink /etc/systemd/system/basic.target.wants/firewalld.service.
[root@localhost ~]# vi /etc/sysconfig/selinux
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - No SELinux policy is loaded.
SELINUX=disabled
# SELINUXTYPE= can take one of three two values:
# targeted - Targeted processes are protected,
# minimum - Modification of targeted policy. Only selected processes are protected.
# mls - Multi Level Security protection.
SELINUXTYPE=targeted
[root@localhost ~]# setenforce 02、下载couchbase
[root@localhost ~]# wget https://packages.couchbase.com/releases/4.6.2/couchbase-server-enterprise-4.6.2-centos7.x86_64.rpmcouchbase官网地址：https://×××w.couchbase.com/downloads
3、确认依赖包是否安装，如果没安装yum安装下。
[root@localhost ~]# rpm -qa | grep "pkgconfig"
pkgconfig-0.27.1-4.el7.x86_64
[root@localhost ~]# rpm -qa | grep "openssl"
openssl-libs-1.0.1e-42.el7.9.x86_64
openssl-1.0.1e-42.el7.9.x86_644、安装couchbase
[root@localhost ~]# rpm -ivh couchbase-server-enterprise-4.6.2-centos7.x86_64.rpm
准备中... ################################# [100%]
Warning: Transparent hugepages looks to be active and should not be.
Please look at http://bit.ly/1ZAcLjD as for how to PERMANENTLY alter this setting.
Warning: Swappiness is not set to 0.
Please look at http://bit.ly/1k2CtNn as for how to PERMANENTLY alter this setting.
Minimum RAM required : 4 GB
System RAM configured : 0.95 GB
Minimum number of processors required : 4 cores
Number of processors on the system : 1 cores
正在升级/安装...
1:couchbase-server-4.6.2-3905 ################################# [100%]
Created symlink from /etc/systemd/system/multi-user.target.wants/couchbase-server.service to /usr/lib/systemd/system/couchbase-server.service.
You have successfully installed Couchbase Server.
Please browse to http://localhost.localdomain:8091/ to configure your server.
Please refer to http://couchbase.com for additional resources.
Please note that you have to update your firewall configuration to
allow connections to the following ports:
4369, 8091 to 8094, 9100 to 9105, 9998, 9999, 11209 to 11211,
11214, 11215, 18091 to 18093, and from 21100 to 21299.
By using this software you agree to the End User License Agreement.
See /opt/couchbase/LICENSE.txt.5、服务状态与开机自启
[root@test1 ~]# systemctl status couchbase-server
[root@test1 ~]# systemctl enable couchbase-server二、couchbase集群配置（node1）
集群初始化有以下方式，这里我们以web控制台方式为例：
* Couchbase的web控制台 (Couchbase Web Console)
* Couchbase的命令行 (Couchbase Command Line Interface)
* Couchbase的API接口(Couchbase REST API)
1、浏览器输入http://192.168.146.126:8091/访问
2、选择“Strat a new cluster”选项，这里主要是设置RAM Quota、Database path和Indexes path
在配置服务器界面，你有如下选项：
* 创建新的集群(Start a new cluster)
* 加入已有集群(Join a cluster now)
* 配置存储(Configure Disk Storage)
* 配置服务器的主机名(Configure Server Hostname)
3、按照默认设置
4、缺省的bucket不建议分配过大，勾选Flush下的Enable复选框
5、勾选同意
6、设置后台管理Administrator密码
7、登陆后首页
8、创建新的Bucket，RAM建议默认，默认会将除了default的所有内存分配给这个Bucket。勾选Flush下的Enable复选框
9、点击刚才创建的bucket进行刷新，如下图
10、新增集群节点，并同步
11、按照上一步的方法添加第三台，效果如下：
其它链接：
http://rdc.hundsun.com/portal/article/736.html
http://rdc.hundsun.com/portal/article/761.html
