mjhjmtu

I use cloud-config to install and configure DCOS cluster.

Normally agentinstall.service service takes 5 minutes to complete.

Is it possible to instruct to systemd to execute agentconfigure.service only after agentinstall.service completed?

#cloud-config
coreos:
 units:
 - name: "agentinstall.service"
 command: "start"
 content: |
 [Unit]
 Description=agent_setup
 After=network.target

 [Service]
 Type=simple
 User=root
 WorkingDirectory=/tmp
 ExecStartPre=/bin/curl -o /tmp/dcos_install.sh http://bootstapnode-0.dev.myztro.internal:9090/dcos_install.sh
 ExecStartPre=/bin/chmod 755 dcos_install.sh
 ExecStart=/bin/bash dcos_install.sh slave

 [Install]
 WantedBy=multi-user.target
 - name: "agentconfigure.service"
 command: "start"
 content: |
 [Unit]
 Description=agent_config
 After=agentinstall.service

 [Service]
 Type=simple
 User=root
 WorkingDirectory=/opt/mesosphere/etc/
 ExecStartPre=/bin/echo "MESOS_ATTRIBUTES=cluster:uploader" >> /opt/mesosphere/etc/mesos-slave-common
 ExecStartPre=/bin/rm -f /var/lib/mesos/slave/meta/slaves/latest
 ExecStart=/usr/bin/systemctl restart dcos-mesos-slave

 [Install]
 WantedBy=multi-user.target

Thank you.

I am not aware of a way to get this done with systemd, as I think it is only concerned about starting and running of units. As in, you can use After= to force a unit to start only AFTER the specified one has started, or both start in parallel.

Wants= will cause the specified units to be started in parallel (if the wanted units are not yet started/active), not what you want.

Requires= will, if used in conjunction with After= on agentconfigure.service, ensure that agentconfigure.service is started AFTER agentinstall.service is active ("busy"). Now, you could have a loop in agentconfigure.service that waits, say max 5 minutes, and regularly checks for agentinstall.service to complete before it proceeds with its actual work. The only option I see for this.

EDIT: Another option I think is even better ... agentinstall.service starts agentconfigure.service when installation succeeds, then exits.

You want to run after the /bin/bash dcos_install.sh slave command?

Change the service with that command to Type=oneshot. Also then I don't think you need to use ExecStartPre=, just use ExecStart= for everything.

@JdeBP asks me to point out that your echo command is attempting to using shell redirection which will not work.