etcd2 static clustering so that changed will be persistent after reboot?

[Edgaras Apšega]

If I setup my etcd2 nodes with these instructions https://coreos.com/etcd/docs/latest/clustering.html, etcd2 is running in foreground, but if I'd quit terminal or reboot servers, changes will not be persistent. Any ideas how to overcome this?

[Rob Szumski]

You will need to run etcd via an init system. On CoreOS, this is systemd. The recommended way to do this is with cloud-config, which is a way of lightly configuring machines in a repeatable fashion. Cloud-config will configure systemd for you. You can see what it is creating by running `systemctl cat etcd2.service` after the machine boots.

There is an example here: https://coreos.com/os/docs/latest/cluster-discovery.html As you can see, the flags you were using map directly to config parameters.

 - Rob

On Jul 15, 2016, at 2:43 AM, Edgaras Apšega <r3sp...@gmail.com> wrote:

If I setup my etcd2 nodes with these instructions https://coreos.com/etcd/docs/latest/clustering.html, etcd2 is running in foreground, but if I'd quit terminal or reboot servers, changes will not be persistent. Any ideas how to overcome this?

--
You received this message because you are subscribed to the Google Groups "CoreOS User" group.
To unsubscribe from this group and stop receiving emails from it, send an email to coreos-user...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[E.A.]

That's where my main problem comes in. I'm provisioning 3 CoreOS machines via libvirt's virt-install; therefore I'm not using cloud-config. 

Is there another way of configuring etcd2.service? Even switched to root I cannot edit /usr/lib64/systemd/system/etcd2.service -- it says that it's "read-only filesystem".

Edgaras

--

Pagarbiai,

Edgaras Apšega

[Rob Szumski]

You can do it all through straight systemd, place etcd2.service in /etc/systemd/system.

[E.A.]

This has worked, thanks!

For anyone else struggling with this problem - make similiar etcd2.service files in /etc/systemd/system/ and then systemctl restart etcd2:

$ systemctl cat etcd2

# /etc/systemd/system/etcd2.service

[Unit]

Description=etcd2

Conflicts=etcd.service

[Service]

User=etcd

Type=notify

Environment=ETCD_DATA_DIR=/var/lib/etcd2

Environment=ETCD_NAME=$ETCD_NODE_NAME

Environment="ETCD_ADVERTISE_CLIENT_URLS=http://192.168.1.139:2379"

Environment="ETCD_DISCOVERY=https://discovery.etcd.io/<token>"

Environment="ETCD_INITIAL_ADVERTISE_PEER_URLS=http://192.168.1.139:2380"

Environment="ETCD_LISTEN_CLIENT_URLS=http://192.168.1.139:2379,http://127.0.0.1:2379"

Environment="ETCD_LISTEN_PEER_URLS=http://192.168.1.139:2380"

ExecStart=/usr/bin/etcd2

Restart=always

RestartSec=10s

LimitNOFILE=40000

TimeoutStartSec=0

[Install]

WantedBy=multi-user.target

--

Pagarbiai,

Edgaras Apšega