初号機 環境構築 その8 サービス・デーモン関係

現状の初号機と弐号機はCentOS7.6 のminimal でインストールしたものをベースに少しずつインストールをしていっているが、現時点でどれだけサービス/デーモンが上がっているか確認。

個別に見ていって、不要そうなものを切っていく。現状では、下記の43個が上がっている。minimalでインストールしたこともあってか、以前にCentOS 7.2でサーバー立てようとしたときと比べると、若干減っている。

$ systemctl list-units --type=service
UNIT                               LOAD   ACTIVE SUB     DESCRIPTION
auditd.service                     loaded active running Security Auditing Service
chronyd.service                    loaded active running NTP client/server
crond.service                      loaded active running Command Scheduler
dbus.service                       loaded active running D-Bus System Message Bus
firewalld.service                  loaded active running firewalld - dynamic firewall daemon
getty@tty1.service                 loaded active running Getty on tty1
irqbalance.service                 loaded active running irqbalance daemon
kmod-static-nodes.service          loaded active exited  Create list of required static device nodes for the current kernel
lvm2-lvmetad.service               loaded active running LVM2 metadata daemon
lvm2-monitor.service               loaded active exited  Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or progress polling
lvm2-pvscan@8:18.service           loaded active exited  LVM2 PV scan on device 8:18
lvm2-pvscan@8:33.service           loaded active exited  LVM2 PV scan on device 8:33
lvm2-pvscan@8:49.service           loaded active exited  LVM2 PV scan on device 8:49
lvm2-pvscan@8:65.service           loaded active exited  LVM2 PV scan on device 8:65
network.service                    loaded active exited  LSB: Bring up/down networking
NetworkManager-wait-online.service loaded active exited  Network Manager Wait Online
NetworkManager.service             loaded active running Network Manager
polkit.service                     loaded active running Authorization Manager
postfix.service                    loaded active running Postfix Mail Transport Agent
rhel-dmesg.service                 loaded active exited  Dump dmesg to /var/log/dmesg
rhel-domainname.service            loaded active exited  Read and set NIS domainname from /etc/sysconfig/network
rhel-import-state.service          loaded active exited  Import network configuration from initramfs
rhel-readonly.service              loaded active exited  Configure read-only root support
rsyslog.service                    loaded active running System Logging Service
smartd.service                     loaded active running Self Monitoring and Reporting Technology (SMART) Daemon
sshd.service                       loaded active running OpenSSH server daemon
systemd-journal-flush.service      loaded active exited  Flush Journal to Persistent Storage
systemd-journald.service           loaded active running Journal Service
systemd-logind.service             loaded active running Login Service
systemd-random-seed.service        loaded active exited  Load/Save Random Seed
systemd-readahead-collect.service  loaded active exited  Collect Read-Ahead Data
systemd-readahead-replay.service   loaded active exited  Replay Read-Ahead Data
systemd-remount-fs.service         loaded active exited  Remount Root and Kernel File Systems
systemd-sysctl.service             loaded active exited  Apply Kernel Variables
systemd-tmpfiles-setup-dev.service loaded active exited  Create Static Device Nodes in /dev
systemd-tmpfiles-setup.service     loaded active exited  Create Volatile Files and Directories
systemd-udev-trigger.service       loaded active exited  udev Coldplug all Devices
systemd-udevd.service              loaded active running udev Kernel Device Manager
systemd-update-utmp.service        loaded active exited  Update UTMP about System Boot/Shutdown
systemd-user-sessions.service      loaded active exited  Permit User Sessions
systemd-vconsole-setup.service     loaded active exited  Setup Virtual Console
tuned.service                      loaded active running Dynamic System Tuning Daemon
yum-cron.service                   loaded active exited  Run automatic yum updates as a cron job

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.

43 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.

いくつか、「SUB」の欄が”exited”になっているものもあるが、これは別に以上でもなんでもないらしい。

無効になってるサービスも調べてみようということで、systemctl のオプションを変えて試してみた。

$ systemctl list-unit-files -t service
UNIT FILE                                     STATE   
arp-ethers.service                            disabled
auditd.service                                enabled 
autovt@.service                               enabled 
blk-availability.service                      disabled
brandbot.service                              static  
chrony-dnssrv@.service                        static  
chrony-wait.service                           disabled
chronyd.service                               enabled 
console-getty.service                         disabled
console-shell.service                         disabled
container-getty@.service                      static  
cpupower.service                              disabled
crond.service                                 enabled 
dbus-org.fedoraproject.FirewallD1.service     enabled 
dbus-org.freedesktop.hostname1.service        static  
dbus-org.freedesktop.import1.service          static  
dbus-org.freedesktop.locale1.service          static  
dbus-org.freedesktop.login1.service           static  
dbus-org.freedesktop.machine1.service         static  
dbus-org.freedesktop.NetworkManager.service   enabled 
dbus-org.freedesktop.nm-dispatcher.service    enabled 
dbus-org.freedesktop.timedate1.service        static  
dbus.service                                  static  
debug-shell.service                           disabled
dm-event.service                              static  
dracut-cmdline.service                        static  
dracut-initqueue.service                      static  
dracut-mount.service                          static  
dracut-pre-mount.service                      static  
dracut-pre-pivot.service                      static  
dracut-pre-trigger.service                    static  
dracut-pre-udev.service                       static  
dracut-shutdown.service                       static  
ebtables.service                              disabled
emergency.service                             static  
firewalld.service                             enabled 
fstrim.service                                static  
getty@.service                                enabled 
halt-local.service                            static  
initrd-cleanup.service                        static  
initrd-parse-etc.service                      static  
initrd-switch-root.service                    static  
initrd-udevadm-cleanup-db.service             static  
iprdump.service                               disabled
iprinit.service                               disabled
iprupdate.service                             disabled
irqbalance.service                            enabled 
kdump.service                                 disabled
kmod-static-nodes.service                     static  
lvm2-lvmetad.service                          static  
lvm2-lvmpolld.service                         static  
lvm2-monitor.service                          enabled 
lvm2-pvscan@.service                          static  
mdadm-grow-continue@.service                  static  # 初号機のみ
mdadm-last-resort@.service                    static  # 初号機のみ
mdmon@.service                                static  # 初号機のみ
mdmonitor.service                             enabled # 初号機のみ
messagebus.service                            static  
microcode.service                             enabled 
NetworkManager-dispatcher.service             enabled 
NetworkManager-wait-online.service            enabled 
NetworkManager.service                        enabled 
plymouth-halt.service                         disabled
plymouth-kexec.service                        disabled
plymouth-poweroff.service                     disabled
plymouth-quit-wait.service                    disabled
plymouth-quit.service                         disabled
plymouth-read-write.service                   disabled
plymouth-reboot.service                       disabled
plymouth-start.service                        disabled
plymouth-switch-root.service                  static  
polkit.service                                static  
postfix.service                               enabled 
quotaon.service                               static  
rc-local.service                              static  
rdisc.service                                 disabled
rescue.service                                static  
rhel-autorelabel-mark.service                 disabled
rhel-autorelabel.service                      enabled 
rhel-configure.service                        enabled 
rhel-dmesg.service                            enabled 
rhel-domainname.service                       enabled 
rhel-import-state.service                     enabled 
rhel-loadmodules.service                      enabled 
rhel-readonly.service                         enabled 
rsyslog.service                               enabled 
selinux-policy-migrate-local-changes@.service static  
serial-getty@.service                         disabled
smartd.service                                enabled 
sshd-keygen.service                           static  
sshd.service                                  enabled 
sshd@.service                                 static  
systemd-ask-password-console.service          static  
systemd-ask-password-plymouth.service         static  
systemd-ask-password-wall.service             static  
systemd-backlight@.service                    static  
systemd-binfmt.service                        static  
systemd-bootchart.service                     disabled
systemd-firstboot.service                     static  
systemd-fsck-root.service                     static  
systemd-fsck@.service                         static  
systemd-halt.service                          static  
systemd-hibernate-resume@.service             static  
systemd-hibernate.service                     static  
systemd-hostnamed.service                     static  
systemd-hwdb-update.service                   static  
systemd-hybrid-sleep.service                  static  
systemd-importd.service                       static  
systemd-initctl.service                       static  
systemd-journal-catalog-update.service        static  
systemd-journal-flush.service                 static  
systemd-journald.service                      static  
systemd-kexec.service                         static  
systemd-localed.service                       static  
systemd-logind.service                        static  
systemd-machine-id-commit.service             static  
systemd-machined.service                      static  
systemd-modules-load.service                  static  
systemd-nspawn@.service                       disabled
systemd-poweroff.service                      static  
systemd-quotacheck.service                    static  
systemd-random-seed.service                   static  
systemd-readahead-collect.service             enabled 
systemd-readahead-done.service                indirect
systemd-readahead-drop.service                enabled 
systemd-readahead-replay.service              enabled 
systemd-reboot.service                        static  
systemd-remount-fs.service                    static  
systemd-rfkill@.service                       static  
systemd-shutdownd.service                     static  
systemd-suspend.service                       static  
systemd-sysctl.service                        static  
systemd-timedated.service                     static  
systemd-tmpfiles-clean.service                static  
systemd-tmpfiles-setup-dev.service            static  
systemd-tmpfiles-setup.service                static  
systemd-udev-settle.service                   static  
systemd-udev-trigger.service                  static  
systemd-udevd.service                         static  
systemd-update-done.service                   static  
systemd-update-utmp-runlevel.service          static  
systemd-update-utmp.service                   static  
systemd-user-sessions.service                 static  
systemd-vconsole-setup.service                static  
teamd@.service                                static  
tuned.service                                 enabled 
wpa_supplicant.service                        disabled
yum-cron.service                              enabled 

148 unit files listed.

今度は大量に出てきた。enabledが自動起動になっているもの、disabledが自動起動が無効になっているもの、staticは単独では自動起動できないものだそうだ。

参考:https://www.server-memo.net/centos-settings/centos7/systemctl-enable.html

あと、これらサービスの起動順序や依存関係も見れるらしい。

参考:https://www.clear-code.com/blog/2015/12/28.html

こんな感じでコマンド打てば、サービスの一覧取得して、そいつを流し込んで、依存関係をテキストに落とす、なんてことも出来る。

$ for name in `systemctl list-unit-files -t service | awk -F'[. ]' '{print $1}'`; do systemctl list-dependencies $name >> service_list.txt ; done

 

サービスごとの詳細、検討結果は別記事にて。

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