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新Webサーバの構築中でDNS・DHCPサーバであるnanopiシステムを調整しリセットする

その前に状態の確認を行ったところ問題なし

メモ

• リセット前145日連続稼働
• システムダウンが発生して再構成した際にユーザIDが統一されていなかったので調整

ユーザーIDの変更・グループIDの変更
# usermod -u UID username
# usermod -g groupname username

# groupmod -g GID groupname

ユーザー名の変更・グループ名の変更・HOMEの変更
# usermod -l newname oldname
# groupmod -n newgroup oldgroup
# usermod -d /home/user1 -m user1

対応するグループが存在しないオブジェクトがないかチェック
# find / -nouser
# find / -nogroup

• DHCPが自動起動しない（エラー発生，手動起動は問題ない）

$ systemctl status isc-dhcp-server

● isc-dhcp-server.service - LSB: DHCP server
 Loaded: loaded (/etc/init.d/isc-dhcp-server; generated)
 Active: failed (Result: exit-code) since Sat 2022-06-11 17:16:16 JST; 49s ago
 Docs: man:systemd-sysv-generator(8)
 CPU: 252ms

 6月 11 17:16:14 nanopineo dhcpd[1140]: before submitting a bug. These pages explain the proper
 6月 11 17:16:14 nanopineo dhcpd[1140]: process and the information we find helpful for debugging.
 6月 11 17:16:14 nanopineo dhcpd[1140]:
 6月 11 17:16:14 nanopineo dhcpd[1140]: exiting.
 6月 11 17:16:16 nanopineo isc-dhcp-server[996]: Starting ISC DHCPv4 server: dhcpdcheck syslog for diagnostics. ...
 6月 11 17:16:16 nanopineo isc-dhcp-server[1230]: failed!
 6月 11 17:16:16 nanopineo isc-dhcp-server[1231]: failed!
 6月 11 17:16:16 nanopineo systemd[1]: isc-dhcp-server.service: Control process exited, code=exited, status=1/FAILURE
 6月 11 17:16:16 nanopineo systemd[1]: isc-dhcp-server.service: Failed with result 'exit-code'.
 6月 11 17:16:16 nanopineo systemd[1]: Failed to start LSB: DHCP server.

$ sudo service isc-dhcp-server start
$ systemctl status isc-dhcp-server

● isc-dhcp-server.service - LSB: DHCP server
 Loaded: loaded (/etc/init.d/isc-dhcp-server; generated)
 Active: active (running) since Sat 2022-06-11 17:17:27 JST; 6s ago
 Docs: man:systemd-sysv-generator(8)
 Process: 1615 ExecStart=/etc/init.d/isc-dhcp-server start (code=exited, status=0/SUCCESS)
 Tasks: 4 (limit: 905)
 Memory: 2.9M
 CPU: 260ms
 CGroup: /system.slice/isc-dhcp-server.service
 mq1627 /usr/sbin/dhcpd -4 -q -cf /etc/dhcp/dhcpd.conf eth0

 6月 11 17:17:25 nanopineo dhcpd[1627]: Internet Systems Consortium DHCP Server 4.4.1
 6月 11 17:17:25 nanopineo dhcpd[1627]: Copyright 2004-2018 Internet Systems Consortium.
 6月 11 17:17:25 nanopineo dhcpd[1627]: All rights reserved.
 6月 11 17:17:25 nanopineo dhcpd[1627]: For info, please visit https://www.isc.org/software/dhcp/
 6月 11 17:17:25 nanopineo dhcpd[1627]: Wrote 0 deleted host decls to leases file.
 6月 11 17:17:25 nanopineo dhcpd[1627]: Wrote 0 new dynamic host decls to leases file.
 6月 11 17:17:25 nanopineo dhcpd[1627]: Wrote 27 leases to leases file.
 6月 11 17:17:25 nanopineo dhcpd[1627]: Server starting service.
 6月 11 17:17:27 nanopineo isc-dhcp-server[1615]: Starting ISC DHCPv4 server: dhcpd.
 6月 11 17:17:27 nanopineo systemd[1]: Started LSB: DHCP server.