gobgp failed to set zebra config: dial unix /var/run/quagg

https://qiita.com/ttsubo/items/1bdced59f5c99bb548fa

Aug 20 19:09:31 ubuntu gobgpd[21406]: {"level":"fatal","msg":"failed to set zebra config: dial unix /var/run/quagg
Aug 20 19:09:31 ubuntu systemd[1]: gobgp.service: Main process exited, code=exited, status=1/FAILURE
Aug 20 19:09:31 ubuntu systemd[1]: gobgp.service: Failed with result 'exit-code'.

apt-get install quagga

root@ubuntu:/etc/quagga# ls
daemons  zebra.conf
root@ubuntu:/etc/quagga# cat daemons 
zebra=yes
root@ubuntu:/etc/quagga# cat zebra.conf 
hostname gobgp1
password zebra
enable password zebra
root@ubuntu:/etc/quagga#

zebra -d -f zebra.conf

root@ubuntu:/etc/quagga# systemctl restart gobgp
root@ubuntu:/etc/quagga# systemctl status gobgp
● gobgp.service - GoBGP daemon
   Loaded: loaded (/etc/systemd/system/gobgp.service; enabled; vendor preset: enabled)
   Active: active (running) since Thu 2020-08-20 19:35:28 +08; 7s ago
 Main PID: 2847 (gobgpd)
    Tasks: 10 (limit: 4915)
   CGroup: /system.slice/gobgp.service
           └─2847 /usr/local/bin/gobgpd -f /etc/gobgp/gobgpd.toml

Aug 20 19:35:28 gobgp systemd[1]: Started GoBGP daemon.
Aug 20 19:35:28 gobgp gobgpd[2847]: {"level":"info","msg":"gobgpd started","time":"2020-08-20T19:35:28+08:00"}
Aug 20 19:35:28 gobgp gobgpd[2847]: {"Topic":"Config","level":"info","msg":"Finished reading the config file","tim
Aug 20 19:35:28 gobgp gobgpd[2847]: {"Error":"read unix @-u003e/run/quagga/zserv.api: read: connection reset by p
Aug 20 19:35:28 gobgp gobgpd[2847]: {"Topic":"Zebra","level":"warning","msg":"cannot connect to Zebra with message
Aug 20 19:35:28 gobgp gobgpd[2847]: {"Topic":"Zebra","level":"warning","msg":"going to retry another version 3.","
Aug 20 19:35:28 gobgp gobgpd[2847]: {"Topic":"Zebra","level":"info","msg":"success to connect to Zebra with messag
Aug 20 19:35:28 gobgp gobgpd[2847]: {"level":"info","msg":"Peer 192.168.122.166 is added","time":"2020-08-20T19:35
Aug 20 19:35:28 gobgp gobgpd[2847]: {"Topic":"Peer","level":"info","msg":"Add a peer configuration for:192.168.122
Aug 20 19:35:33 gobgp gobgpd[2847]: {"Key":"192.168.122.166","State":"BGP_FSM_OPENCONFIRM","Topic":"Peer","level":
lines 1-18/18 (END)

root@ubuntu:/etc/quagga# gobgp global rib
   Network              Next Hop             AS_PATH              Age        Attrs
*> 192.168.122.0/24     0.0.0.0                                   00:00:48   [{Origin: i} {Med: 0}]
root@ubuntu:/etc/quagga# gobgp neigh
Peer               AS  Up/Down State       |#Received  Accepted
192.168.122.166 65000 00:00:51 Establ      |        0         0
root@ubuntu:/etc/quagga#