first mgmt process

$ ./mgmt run --client-urls http://86.231.179.14:2379 --server-urls http://86.231.179.14:2380 --advertise-client-urls http://86.231.179.14:2379 --advertise-server-urls http://86.231.179.14:2380 --hostname h1 --ideal-cluster-size 1 --tmp-prefix --no-pgp lang --lang examples/lang/exchange0.mcl
2019-03-23 21:00:07.434141 I | cli: lang: lexing/parsing...
2019-03-23 21:00:07.443839 I | cli: lang: init...
2019-03-23 21:00:07.443925 I | cli: lang: interpolating...
2019-03-23 21:00:07.444012 I | cli: lang: building scope...
2019-03-23 21:00:07.444084 I | cli: lang: running type unification...
2019-03-23 21:00:07.444518 I | cli: lang: input: examples/lang/exchange0.mcl
2019-03-23 21:00:07.444566 I | cli: lang: tree:
.
├── exchange0.mcl
└── metadata.yaml
21:00:07 hello.go:49: this is: mgmt, version: 0.0.17-57-g17bbadf-dirty
21:00:07 hello.go:50: main: start: 1553371207444624903
21:00:07 main.go:192: main: warning: working prefix directory is temporary!
21:00:07 main.go:192: main: working prefix is: /tmp/mgmt-h1-217806659
21:00:07 main.go:192: main: etcd: seeds: no seeds specified!
21:00:07 etcd.go:446: Etcd: Bootstrapping...
21:00:07 etcd.go:1483: Etcd: Nominated: h1=http://86.231.179.14:2380
21:00:07 etcd.go:1498: Etcd: StartServer(newCluster: true): h1=http://86.231.179.14:2380
21:00:07 etcd.go:1773: Etcd: StartServer: Starting server...
21:00:07 etcd.go:361: Etcd: Connect: Endpoints: []
21:00:07 etcd.go:375: Etcd: Connect: CtxError...
21:00:07 etcd.go:655: Etcd: CtxError: Reason: CtxDelayErr(1s): No endpoints available yet!
21:00:08 etcd.go:1780: Etcd: StartServer: Done starting server!
21:00:08 etcd.go:1798: Etcd: StartServer: Server running...
21:00:08 etcd.go:1521: Etcd: Addresses are: http://localhost:2379
21:00:08 etcd.go:359: Etcd: Connect: Endpoints: h1=http://localhost:2379
21:00:08 etcd.go:1845: Etcd: ApplyDeltaEvents: Event(PUT): h1
21:00:08 etcd.go:1483: Etcd: Nominated: h1=http://86.231.179.14:2380
21:00:08 etcd.go:466: Etcd: Startup: Volunteering...
21:00:08 etcd.go:1689: Etcd: Ideal cluster size is now: 1
21:00:08 etcd.go:1033: Etcd: Set(/_mgmt/idealClusterSize): &{cluster_id:4053399070952304541 member_id:11883720917534354354 revision:4 raft_term:2  <nil>}
21:00:08 etcd.go:1283: Etcd: Members: List: [h1]
21:00:08 etcd.go:1306: Etcd: Leader: h1
21:00:08 etcd.go:1325: Etcd: Volunteers: [h1]
21:00:08 etcd.go:1329: Etcd: Quitters: []
21:00:08 etcd.go:1341: Etcd: Candidates: []
21:00:08 etcd.go:1283: Etcd: Members: List: [h1]
21:00:08 etcd.go:1306: Etcd: Leader: h1
21:00:08 etcd.go:1325: Etcd: Volunteers: [h1]
21:00:08 etcd.go:1329: Etcd: Quitters: []
21:00:08 etcd.go:1341: Etcd: Candidates: []
21:00:09 main.go:192: main: waiting...
21:00:09 main.go:192: main: running...
...

second process

$ ./mgmt run --seeds http://86.21.179.14:2379 --hostname h2 --client-urls http://127.0.0.1:2381 --server-urls http://127.0.0.1:2382 --tmp-prefix --no-pgp lang --lang examples/lang/exchange0.mcl
2019-03-23 21:00:42.547985 I | cli: lang: lexing/parsing...
2019-03-23 21:00:42.557270 I | cli: lang: init...
2019-03-23 21:00:42.557355 I | cli: lang: interpolating...
2019-03-23 21:00:42.557446 I | cli: lang: building scope...
2019-03-23 21:00:42.557521 I | cli: lang: running type unification...
2019-03-23 21:00:42.558026 I | cli: lang: input: examples/lang/exchange0.mcl
2019-03-23 21:00:42.558076 I | cli: lang: tree:
.
├── exchange0.mcl
└── metadata.yaml
21:00:42 hello.go:49: this is: mgmt, version: 0.0.17-57-g17bbadf-dirty
21:00:42 hello.go:50: main: start: 1553371242558165160
21:00:42 main.go:192: main: warning: working prefix directory is temporary!
21:00:42 main.go:192: main: working prefix is: /tmp/mgmt-h2-717792969
21:00:42 main.go:192: main: etcd: seeds(1): http://86.21.179.14:2379
21:00:42 etcd.go:419: Etcd: Startup: Getting initial values...
21:00:42 etcd.go:359: Etcd: Connect: Endpoints: _seed=http://86.21.179.14:2379
21:00:47 etcd.go:375: Etcd: Connect: CtxError...
21:00:47 etcd.go:748: Etcd: CtxError: DeadlineExceeded(context.deadlineExceededError): context deadline exceeded
21:00:47 etcd.go:756: Etcd: CtxError: Unknown error(context.deadlineExceededError): context deadline exceeded
21:00:48 etcd.go:377: Etcd: Connect: CtxError: Fatal: unknown CtxError
21:00:48 etcd.go:401: Etcd: Startup: Error: unknown CtxError

This will not work because if you look at the second process:

client-urls http://127.0.0.1:2381 --server-urls http://127.0.0.1:2382

That is where the first one will look! You need it to specify advertise as well, or have those be on the same network as first. So instead run:

$ ./mgmt run --client-urls http://86.231.179.99:2379 --server-urls http://86.231.179.99:2380 --advertise-client-urls http://86.231.179.99:2379 --advertise-server-urls http://86.231.179.99:2380 --hostname h2 --tmp-prefix --no-pgp lang --lang examples/lang/exchange0.mcl

Note I changed hostname to h2 and removed ideal cluster size.

(Although you'd think it would work with ideal-cluster-size = 1... Hmmm)

I'd also check the firewall. And if you still have issues, I'd have to look because this worked for me. Rewrite of this code is landing shortly anyways :/