そろそろCentOS7をさわっていくか systemctlコマンドを確認していく
typeでの一覧表示。下記はserviceでのコマンド例。
ACTIVE欄がfailedになっている場合は本来有効化される設定のUnitが動いてない場合。
[root@localhost ~]# systemctl --type=service UNIT LOAD ACTIVE SUB DESCRIPTION auditd.service loaded active running Security Auditing Service avahi-daemon.service loaded active running Avahi mDNS/DNS-SD Stack chronyd.service loaded active running NTP client/server crond.service loaded active running Command Scheduler (中略） systemd-vconsole-setup.service loaded active exited Setup Virtual Console tuned.service loaded active running Dynamic System Tuning Daemon LOAD = Reflects whether the unit definition was properly loaded. ACTIVE = The high-level unit activation state, i.e. generalization of SUB. SUB = The low-level unit activation state, values depend on unit type. 37 loaded units listed. Pass --all to see loaded but inactive units, too. To show all installed unit files use 'systemctl list-unit-files'.
failedしたUnitを表示する
[root@localhost ~]# systemctl --failed 0 loaded units listed. Pass --all to see loaded but inactive units, too. To show all installed unit files use 'systemctl list-unit-files'.
現在の状態関係なく定義されてるUnitを確認する。
grepと合わせて設定状態の個別確認にも使える。
STATEの詳細はenable 有効、disable 無効、static 自動起動設定を持たないもの
[root@localhost ~]# systemctl list-unit-files --type=service UNIT FILE STATE arp-ethers.service disabled auditd.service enabled （中略） systemd-user-sessions.service static systemd-vconsole-setup.service static teamd@.service static tomcat.service disabled tuned.service enabled wpa_supplicant.service disabled 125 unit files listed. [root@localhost ~]# systemctl list-unit-files --type=service | grep tomcat tomcat.service disabled
Unitの有効・無効化を行うには
systemctl enable Unit名
systemctl disable Unit名
で行います。
systemctl is-enabled Unit名 で有効・無効化の状態を確認します。
下記はtomcatの状態を確認して有効化後、確認。
そして、また無効化して確認した例です。
[root@localhost ~]# systemctl is-enabled tomcat disabled [root@localhost ~]# systemctl enable tomcat ln -s '/usr/lib/systemd/system/tomcat.service' '/etc/systemd/system/multi-user.target.wants/tomcat.service' [root@localhost ~]# systemctl is-enabled tomcat enabled [root@localhost ~]# systemctl disable tomcat rm '/etc/systemd/system/multi-user.target.wants/tomcat.service' [root@localhost ~]# systemctl is-enabled tomcat disabled
OS起動後にUnitを手動制御
systemctl start Unit名
systemctl restart Unit名
systemctl reload Unit名
systemctl stop Unit名
下記はtomcatをstart,stopした例
※設定ファイルに記述がない場合はコマンドは発行出来ません。
[root@localhost ~]# systemctl start tomcat [root@localhost ~]# ps -ef | grep java tomcat 2286 1 19 13:49 ? 00:00:01 java -classpath /usr/share/tomcat/bin/bootstrap.jar:/usr/share/tomcat/bin/tomcat-juli.jar:/usr/share/java/commons-daemon.jar -Dcatalina.base=/usr/share/tomcat -Dcatalina.home=/usr/share/tomcat -Djava.endorsed.dirs= -Djava.io.tmpdir=/var/cache/tomcat/temp -Djava.util.logging.config.file=/usr/share/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager org.apache.catalina.startup.Bootstrap start root 2306 2164 0 13:49 pts/0 00:00:00 grep --color=auto java [root@localhost ~]# systemctl stop tomcat [root@localhost ~]# ps -ef | grep java root 2344 2164 0 13:49 pts/0 00:00:00 grep --color=auto java
systemdを再起動して追加や変更のあったUnitの設定を読み込み直す。
[root@localhost ~]# systemctl daemon-reload
