Usando o CentOS 7, resolvi isso criando o /lib/systemd/system/couchbase-server.service com o seguinte:
# -*- mode: conf-unix; -*-
[Unit]
Description = Couchbase Server
Documentation = http://docs.couchbase.com
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
Ativar com:
systemctl daemon-reload && systemctl enable couchbase-server && systemctl restart couchbase-server