Ignition config - run shell command

[Denriful]

Is there any way to run shell command after bootup the node via ignition config? 

[Rob Szumski]

You can write out a “oneshot” unit that contains ExecStart=/bin/sh…

More info here: https://www.digitalocean.com/community/tutorials/understanding-systemd-units-and-unit-files

 - Rob

On May 12, 2017, at 12:31 AM, 'Denriful' via CoreOS User <coreo...@googlegroups.com> wrote:

Is there any way to run shell command after bootup the node via ignition config? 

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[Denriful]

Thanks! 

but i still can't start it on boot:

consul-install.sh:

#!/bin/bash

wget https://releases.hashicorp.com/consul/0.8.1/consul_0.8.1_linux_amd64.zip

unzip consul_0.8.1_linux_amd64.zip

sudo chmod +x consul

sudo mkdir -p /opt/bin

sudo mv consul /opt/bin/

sudo mkdir -p /etc/consul.d

sudo chmod a+w /etc/consul.d

sudo mkdir -p /opt/consul/data

sudo mkdir -p /var/log/consul

sudo chmod a+w /var/log/consul

nohup /opt/bin/consul agent -config-file /etc/consul.d/consul-core1.json  >consul.log  2>&1 &

consul.service:

[Unit]

Description=Setup Consul Cluster

[Service]

Type=oneshot

ExecStart=/opt/bin/consul-install.sh

RemainAfterExit=true

[Install]

WantedBy=multi-user.target

Then the node is booted there is no running consul service

i need to run "systemctl start consul.service" to start it.

How to run just created systemd service on first boot?

пятница, 12 мая 2017 г., 23:04:26 UTC+7 пользователь Rob Szumski написал:

[paul...@coreos.com]

It might make sense to do a one-shot for install, and then run a normal service unit file for regular use.

[Euan Kemp]

> On Monday, May 15, 2017 at 3:20:10 AM UTC-7, Denriful wrote:
> consul.service:
> |
> [Unit]
> Description=Setup Consul Cluster
>
> [Service]
> Type=oneshot
> ExecStart=/opt/bin/consul-install.sh
> RemainAfterExit=true
>
> [Install]
> WantedBy=multi-user.target
>
> |
>
> Then the node is booted there is no running consul service
> i need to run "systemctl start consul.service" to start it.
>
> How to run just created systemd service on first boot?
>

If you enable the service file (e.g. using ignition's 'enable' option
when creating it or using `systemctl enable`) it should run on boot boot.

You'll probably also have to have 'After=network-online.target' and
'Requires=network-online.target' in order to ensure the 'wget' in the
script works.

One other cool trick you can use is adding>
ConditionPathExists=!/opt/bin/consul
to the unit which downloads agent so it only runs once.

This assumes you do split out running the agent to its own unit, which
you probably should.

Best,
Euan