Ubuntu开机启动的方式

woceshiyong8

　　方法一：
--------------------------------------------------
1. 在/etc/init.d/下放置启动脚本，比如postgresql
root@ubuntu:/etc/init.d# cat postgresql
#!/bin/sh
set -e
　　### BEGIN INIT INFO
# Provides:postgresql
# Required-Start:$local_fs $remote_fs $network $time
# Required-Stop:$local_fs $remote_fs $network $time
# Should-Start:$syslog
# Should-Stop:$syslog
# Default-Start:2 3 4 5
# Default-Stop:0 1 6
# Short-Description:PostgreSQL RDBMS server
### END INIT INFO
　　# Setting environment variables for the postmaster here does not work; please
# set them in /etc/postgresql/<version>/<cluster>/environment instead.

[ -r /usr/share/postgresql-common/init.d-functions ] || exit 0

　　. /usr/share/postgresql-common/init.d-functions
　　# versions can be specified explicitly
if [ -n "$2" ]; then
    versions="$2 $3 $4 $5 $6 $7 $8 $9"
else
    get_versions
fi
　　case "$1" in
    start|stop|restart|reload)
        if [ "$1" = "start" ]; then
            create_socket_directory
        fi
if [ -z "`pg_lsclusters -h`" ]; then
    log_warning_msg 'No PostgreSQL clusters exist; see "man pg_createcluster"'
    exit 0
fi
for v in $versions; do
    $1 $v || EXIT=$?
done
exit ${EXIT:-0}
        ;;
    status)
LS=`pg_lsclusters -h`
# no clusters -> unknown status
[ -n "$LS" ] || exit 4
echo "$LS" | awk 'BEGIN {rc=0} {if (match($4, "down")) rc=3; printf ("%s/%s (port %s): %s\n", $1, $2, $3, $4)}; END {exit rc}'
;;
    force-reload)
for v in $versions; do
    reload $v
done
        ;;
    *)
        echo "Usage: $0 {start|stop|restart|reload|force-reload|status} [version ..]"
        exit 1
        ;;
esac
　　exit 0
　　2. 添加服务
   cd /etc/init.d/
   update-rc.d postgresql defaults 90
  
3. 删除启动
   update-rc.d -f postgresql remove
　　
方法二
-------------
1. 启动脚本：/etc/systemd/system/postgresql.service
[Unit]
Description=PostgreSQL database server
After=network.target

[Service]
Type=forking
User=postgres
Group=postgres
OOMScoreAdjust=-1000
Environment=PG_OOM_ADJUST_FILE=/proc/self/oom_score_adj
Environment=PG_OOM_ADJUST_VALUE=0
Environment=PGSTARTTIMEOUT=270
Environment=PGDATA=/data/postgresql/data
ExecStart=/usr/local/pgsql/bin/pg_ctl start -D ${PGDATA} -s -w -t ${PGSTARTTIMEOUT}
ExecStop=/usr/local/pgsql/bin/pg_ctl stop -D ${PGDATA} -s -m fast
ExecReload=/usr/local/pgsql/bin/pg_ctl reload -D ${PGDATA} -s
TimeoutSec=300

[Install]
WantedBy=multi-user.target

　　2. 添加启动
systemctl daemon-reload
systemctl enable postgresql