etcd in gateway/grpc_proxy mode hangs on startup

[Neil Wilson]

If you set the DAEMON_ARGS of etcd so that it runs in gateway or grpc_proxy mode, the unit file will hang on startup

● etcd.service - etcd - highly-available key value store
   Loaded: loaded (/lib/systemd/system/etcd.service; enabled; vendor preset: ena
   Active: activating (start) since Fri 2017-05-19 09:22:09 UTC; 1min 25s ago
     Docs: https://github.com/coreos/etcd
           man:etcd
 Main PID: 24451 (etcd)
    Tasks: 7 (limit: 4915)
   Memory: 8.1M
      CPU: 32ms
   CGroup: /system.slice/etcd.service
           └─24451 /usr/bin/etcd gateway start --endpoints=grp-ux6nb.gb1s.bright

Presumable the type of daemon is different in normal mode, from when it is running as the newer proxy modes.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: etcd 3.1.0-1
ProcVersionSignature: User Name 4.10.0-21.23-generic 4.10.11
Uname: Linux 4.10.0-21-generic x86_64
ApportVersion: 2.20.4-0ubuntu4
Architecture: amd64
Date: Fri May 19 09:22:57 2017
SourcePackage: etcd
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.default.etcd:
 #### Daemon parameters:
 DAEMON_ARGS="gateway start --endpoints=grp-ux6nb.gb1s.brightbox.com:2379 --listen-addr=127.0.0.1:2379"
mtime.conffile..etc.default.etcd: 2017-05-19T09:22:55.238937

[Neil Wilson (neil-aldur)]

This appears to be fixed in 3.1.3 of etcd where they have fixed the sd_notify behaviour.

etcd v3.1.3 (2017-03-10)
- use machine default host when advertise URLs are default
  values(localhost:2379,2380) AND if listen URL is 0.0.0.0
- fix 'etcd gateway' schema handling in DNS discovery
- fix sd_notify behaviors in gateway, grpc-proxy