[Images]: remove services which we don't need during image creation
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yaronkaikov commented
Following https://github.com/scylladb/scylla-enterprise/issues/2501, we noticed that at least one service is running in our images (seen in AMI) which is not needed - fwupdmgr.
Running systemctl on our latest ami image we have got the following list:
scyllaadm@ip-10-0-4-249:~$ systemctl | grep "running\|waiting"
proc-sys-fs-binfmt_misc.automount loaded active running Arbitrary Executable File Formats File System Automount Point
acpid.path loaded active running ACPI Events Check
systemd-ask-password-console.path loaded active waiting Dispatch Password Requests to Console Directory Watch
systemd-ask-password-wall.path loaded active waiting Forward Password Requests to Wall Directory Watch
init.scope loaded active running System and Service Manager
session-1.scope loaded active running Session 1 of User scyllaadm
acpid.service loaded active running ACPI event daemon
amazon-ssm-agent.service loaded active running amazon-ssm-agent
chrony.service loaded active running chrony, an NTP client/server
cron.service loaded active running Regular background program processing daemon
dbus.service loaded active running D-Bus System Message Bus
fwupd.service loaded active running Firmware update daemon
getty@tty1.service loaded active running Getty on tty1
irqbalance.service loaded active running irqbalance daemon
multipathd.service loaded active running Device-Mapper Multipath Device Controller
networkd-dispatcher.service loaded active running Dispatcher daemon for systemd-networkd
polkit.service loaded active running Authorization Manager
rsyslog.service loaded active running System Logging Service
scylla-jmx.service loaded active running Scylla JMX
scylla-node-exporter.service loaded active running Prometheus exporter for machine metrics
scylla-server.service loaded active running Scylla Server
serial-getty@ttyS0.service loaded active running Serial Getty on ttyS0
ssh.service loaded active running OpenBSD Secure Shell server
systemd-journald.service loaded active running Journal Service
systemd-logind.service loaded active running User Login Management
systemd-networkd.service loaded active running Network Configuration
systemd-resolved.service loaded active running Network Name Resolution
systemd-udevd.service loaded active running Rule-based Manager for Device Events and Files
user@1000.service loaded active running User Manager for UID 1000
uuidd.service loaded active running Daemon for generating UUIDs
acpid.socket loaded active running ACPID Listen Socket
dbus.socket loaded active running D-Bus System Message Bus Socket
multipathd.socket loaded active running multipathd control socket
syslog.socket loaded active running Syslog Socket
systemd-journald-audit.socket loaded active running Journal Audit Socket
systemd-journald-dev-log.socket loaded active running Journal Socket (/dev/log)
systemd-journald.socket loaded active running Journal Socket
systemd-networkd.socket loaded active running Network Service Netlink Socket
systemd-udevd-control.socket loaded active running udev Control Socket
systemd-udevd-kernel.socket loaded active running udev Kernel Socket
uuidd.socket loaded active running UUID daemon activation socket
apt-daily-upgrade.timer loaded active waiting Daily apt upgrade and clean activities
apt-daily.timer loaded active waiting Daily apt download activities
dpkg-db-backup.timer loaded active waiting Daily dpkg database backup timer
e2scrub_all.timer loaded active waiting Periodic ext4 Online Metadata Check for All Filesystems
fstrim.timer loaded active waiting Discard unused blocks once a week
fwupd-refresh.timer loaded active waiting Refresh fwupd metadata regularly
logrotate.timer loaded active waiting Daily rotation of log files
man-db.timer loaded active waiting Daily man-db regeneration
motd-news.timer loaded active waiting Message of the Day
scylla-housekeeping-daily.timer loaded active waiting Run Scylla Housekeeping daily mode
systemd-tmpfiles-clean.timer loaded active waiting Daily Cleanup of Temporary Directories
ua-timer.timer loaded active waiting Ubuntu Advantage Timer for running repeated jobs
Let's review this list and make sure what can be removed
mykaul commented
In no particular order:
- Don't know if we need acpid.socket and acpid.service - I don't think so.
- We don't need man-db.timer
- Don't know if we need motd-news.timer
- Don't know if we need ua-timer.timer
Assuming we don't do regular in-place updates of packages, we probably don't need: - apt-daily-upgrade.timer
- apt-daily.timer
- Don't know if we need dpkg-db-backup.timer - probably safe to keep though.
- We should disable/mask fwupd-refresh.timer and fwupd.service
- Don't know if we need multipathd.socket - doubt that.