解決方法：

1. 輸入命令：vim /lib/systemd/system/couchbase-server.service，添加如下內容：

# -*- mode: conf-unix; -*-
[Unit]
Description = Couchbase Server
Documentation = http://docs.
After = network.target remote-fs.target nss-lookup.target

[Service]
SyslogIdentifier = couchbase
User = couchbase
Type = forking
PIDFile=/opt/couchbase/var/lib/couchbase/couchbase-server.pid
WorkingDirectory = /opt/couchbase/var/lib/couchbase
LimitNOFILE = 40960
LimitCORE = unlimited
LimitMEMLOCK = unlimited
ExecStart = /opt/couchbase/bin/couchbase-server -noinput -detached > /opt/couchbase/var/lib/couchbase/logs/start.log 2>&1
ExecStop = /opt/couchbase/bin/couchbase-server -k

[Install]
WantedBy = multi-user.target

2. systemctl daemon-reload

3. systemctl enable couchbase-server

4. systemctl restart couchbase-server

啟動就好了

如果無法http訪問，可能是防火墻開著并且沒有正確配置。couchbase需要如下端口：

Table 2.1. Getting Started — Network Ports

1. SELINUX是否開啟并且沒有設置：

geteforce，可以暫時用setenforce 0 關閉，不過建議還是開啟，可以參照:http://rdc./eps/blog/132.html

2. 檢查firewalld:

- 檢查端口：firewall-cmd --zone=public  --list-ports

- 添加端口：

firewall-cmd --zone=public --add-port=4369/tcp --permanent
firewall-cmd --zone=public --add-port=4369/udp --permanent
firewall-cmd --zone=public --add-port=8091/tcp --permanent
firewall-cmd --zone=public --add-port=8092/tcp --permanent
firewall-cmd --zone=public --add-port=8092/udp --permanent
firewall-cmd --zone=public --add-port=11209/tcp --permanent
firewall-cmd --zone=public --add-port=11210/tcp --permanent
firewall-cmd --zone=public --add-port=11211/tcp --permanent
firewall-cmd --zone=public --add-port=11209/udp --permanent
firewall-cmd --zone=public --add-port=11210/udp --permanent
firewall-cmd --zone=public --add-port=11211/udp --permanent
firewall-cmd --zone=public --add-port=21100-21199udp --permanent
firewall-cmd --reload