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How to ensure a Ubuntu 16 systemd unit waits for ntpd to sync before starting?

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1

We have a service that starts at boot. We need to ensure it doesn't start until the system clock has been synchronized via ntp. The machines are using ntpd.

The machines are using ntpd and not systemd-timesyncd for doing timesync. Can someone let me know what pre-conditions I have to wait for in the unit file.

Below is the content of ntp.service

support@vrni-platform:/etc/init.d$ sudo systemctl cat ntp.service
# /run/systemd/generator.late/ntp.service
# Automatically generated by systemd-sysv-generator

[Unit]
Documentation=man:systemd-sysv-generator(8)
SourcePath=/etc/init.d/ntp
Description=LSB: Start NTP daemon
Before=multi-user.target
Before=multi-user.target
Before=multi-user.target
Before=graphical.target
After=network-online.target
After=remote-fs.target
After=systemd-journald-dev-log.socket
Wants=network-online.target

[Service]
Type=forking
Restart=no
TimeoutSec=5min
IgnoreSIGPIPE=no
KillMode=process
GuessMainPID=no
RemainAfterExit=yes
ExecStart=/etc/init.d/ntp start
ExecStop=/etc/init.d/ntp stop

Below is a sample unit file which needs ntp sync

[Unit]
Description=Zookeeper Service
After=network-online.target
Wants=network-online.target

[Service]

Type=simple
ExecStartPre=-/bin/mkdir -p /var/log/zookeeper
ExecStartPre=-/bin/chown zookeeper /var/log/zookeeper
ExecStartPre=-/bin/mkdir -p /var/run/zookeeper
ExecStartPre=-/bin/chown zookeeper:zookeeper /var/run/zookeeper


ExecStartPre=-/bin/bash /usr/bin/zookeeper-systemd-prestart.sh
ExecStartPre=-/bin/su zookeeper -s /bin/bash -c '/usr/bin/zookeeper-server start'
ExecStartPre=-/bin/sleep 3
ExecStart=/bin/bash /usr/bin/zookeeper-systemd-health.sh
ExecStopPost=-/bin/bash /usr/bin/zookeeper-systemd-poststop.sh


RestartSec=2s
Restart=always


LimitNOFILE=65535

[Install]
WantedBy=multi-user.target

ubuntu ubuntu-16.04

share|improve this question

edited 2 days ago

tuk

asked 2 days ago

tuktuk

16618

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possible duplicate of Systemd dependencies and boot order
  
  – HBruijn
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I don't think this is a duplicate question. I have edited my question.
  
  – tuk
  2 days ago
  

  
  
  
  

add a comment | 

1

We have a service that starts at boot. We need to ensure it doesn't start until the system clock has been synchronized via ntp. The machines are using ntpd.

The machines are using ntpd and not systemd-timesyncd for doing timesync. Can someone let me know what pre-conditions I have to wait for in the unit file.

Below is the content of ntp.service

support@vrni-platform:/etc/init.d$ sudo systemctl cat ntp.service
# /run/systemd/generator.late/ntp.service
# Automatically generated by systemd-sysv-generator

[Unit]
Documentation=man:systemd-sysv-generator(8)
SourcePath=/etc/init.d/ntp
Description=LSB: Start NTP daemon
Before=multi-user.target
Before=multi-user.target
Before=multi-user.target
Before=graphical.target
After=network-online.target
After=remote-fs.target
After=systemd-journald-dev-log.socket
Wants=network-online.target

[Service]
Type=forking
Restart=no
TimeoutSec=5min
IgnoreSIGPIPE=no
KillMode=process
GuessMainPID=no
RemainAfterExit=yes
ExecStart=/etc/init.d/ntp start
ExecStop=/etc/init.d/ntp stop

Below is a sample unit file which needs ntp sync

[Unit]
Description=Zookeeper Service
After=network-online.target
Wants=network-online.target

[Service]

Type=simple
ExecStartPre=-/bin/mkdir -p /var/log/zookeeper
ExecStartPre=-/bin/chown zookeeper /var/log/zookeeper
ExecStartPre=-/bin/mkdir -p /var/run/zookeeper
ExecStartPre=-/bin/chown zookeeper:zookeeper /var/run/zookeeper


ExecStartPre=-/bin/bash /usr/bin/zookeeper-systemd-prestart.sh
ExecStartPre=-/bin/su zookeeper -s /bin/bash -c '/usr/bin/zookeeper-server start'
ExecStartPre=-/bin/sleep 3
ExecStart=/bin/bash /usr/bin/zookeeper-systemd-health.sh
ExecStopPost=-/bin/bash /usr/bin/zookeeper-systemd-poststop.sh


RestartSec=2s
Restart=always


LimitNOFILE=65535

[Install]
WantedBy=multi-user.target

ubuntu ubuntu-16.04

share|improve this question

edited 2 days ago

tuk

asked 2 days ago

tuktuk

16618

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possible duplicate of Systemd dependencies and boot order
  
  – HBruijn
  2 days ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I don't think this is a duplicate question. I have edited my question.
  
  – tuk
  2 days ago
  

  
  
  
  

add a comment | 

We have a service that starts at boot. We need to ensure it doesn't start until the system clock has been synchronized via ntp. The machines are using ntpd.

The machines are using ntpd and not systemd-timesyncd for doing timesync. Can someone let me know what pre-conditions I have to wait for in the unit file.

Below is the content of ntp.service

support@vrni-platform:/etc/init.d$ sudo systemctl cat ntp.service
# /run/systemd/generator.late/ntp.service
# Automatically generated by systemd-sysv-generator

[Unit]
Documentation=man:systemd-sysv-generator(8)
SourcePath=/etc/init.d/ntp
Description=LSB: Start NTP daemon
Before=multi-user.target
Before=multi-user.target
Before=multi-user.target
Before=graphical.target
After=network-online.target
After=remote-fs.target
After=systemd-journald-dev-log.socket
Wants=network-online.target

[Service]
Type=forking
Restart=no
TimeoutSec=5min
IgnoreSIGPIPE=no
KillMode=process
GuessMainPID=no
RemainAfterExit=yes
ExecStart=/etc/init.d/ntp start
ExecStop=/etc/init.d/ntp stop

Below is a sample unit file which needs ntp sync

[Unit]
Description=Zookeeper Service
After=network-online.target
Wants=network-online.target

[Service]

Type=simple
ExecStartPre=-/bin/mkdir -p /var/log/zookeeper
ExecStartPre=-/bin/chown zookeeper /var/log/zookeeper
ExecStartPre=-/bin/mkdir -p /var/run/zookeeper
ExecStartPre=-/bin/chown zookeeper:zookeeper /var/run/zookeeper


ExecStartPre=-/bin/bash /usr/bin/zookeeper-systemd-prestart.sh
ExecStartPre=-/bin/su zookeeper -s /bin/bash -c '/usr/bin/zookeeper-server start'
ExecStartPre=-/bin/sleep 3
ExecStart=/bin/bash /usr/bin/zookeeper-systemd-health.sh
ExecStopPost=-/bin/bash /usr/bin/zookeeper-systemd-poststop.sh


RestartSec=2s
Restart=always


LimitNOFILE=65535

[Install]
WantedBy=multi-user.target

ubuntu ubuntu-16.04

share|improve this question

edited 2 days ago

tuk

asked 2 days ago

tuktuk

16618

support@vrni-platform:/etc/init.d$ sudo systemctl cat ntp.service
# /run/systemd/generator.late/ntp.service
# Automatically generated by systemd-sysv-generator

[Unit]
Documentation=man:systemd-sysv-generator(8)
SourcePath=/etc/init.d/ntp
Description=LSB: Start NTP daemon
Before=multi-user.target
Before=multi-user.target
Before=multi-user.target
Before=graphical.target
After=network-online.target
After=remote-fs.target
After=systemd-journald-dev-log.socket
Wants=network-online.target

[Service]
Type=forking
Restart=no
TimeoutSec=5min
IgnoreSIGPIPE=no
KillMode=process
GuessMainPID=no
RemainAfterExit=yes
ExecStart=/etc/init.d/ntp start
ExecStop=/etc/init.d/ntp stop

[Unit]
Description=Zookeeper Service
After=network-online.target
Wants=network-online.target

[Service]

Type=simple
ExecStartPre=-/bin/mkdir -p /var/log/zookeeper
ExecStartPre=-/bin/chown zookeeper /var/log/zookeeper
ExecStartPre=-/bin/mkdir -p /var/run/zookeeper
ExecStartPre=-/bin/chown zookeeper:zookeeper /var/run/zookeeper


ExecStartPre=-/bin/bash /usr/bin/zookeeper-systemd-prestart.sh
ExecStartPre=-/bin/su zookeeper -s /bin/bash -c '/usr/bin/zookeeper-server start'
ExecStartPre=-/bin/sleep 3
ExecStart=/bin/bash /usr/bin/zookeeper-systemd-health.sh
ExecStopPost=-/bin/bash /usr/bin/zookeeper-systemd-poststop.sh


RestartSec=2s
Restart=always


LimitNOFILE=65535

[Install]
WantedBy=multi-user.target

share|improve this question

edited 2 days ago

tuk

asked 2 days ago

tuktuk

16618

share|improve this question

edited 2 days ago

tuk

asked 2 days ago

tuktuk

16618

asked 2 days ago

tuktuk

16618

asked 2 days ago

tuktuk

16618