docker - docker 容器的双向 UDP 端口

Question

我有一个在 docker 容器中运行的领事。
当我启动另一个领事代理(不在 docker 上)时，它说:

[WARN] memberlist: Was able to reach container_name via TCP but not UDP, network may be misconfigured and not allowing bidirectional UDP

我试图在这里形成一个集群，但领导者选举一直失败。
我怎样才能解决这个问题？

我在 docker-compose.yml 中的端口规范( docker 撰写版本:1)

  ports:
    - "8300:8300"
    - "8301:8301"
    - "8301:8301/udp"
    - "8302:8302"
    - "8302:8302/udp"
    - "8400:8400"
    - "8500:8500"
    - "8600:8600"
    - "8600:8600/udp"

Consul1 在 Docker Container 中运行的日志:

         Node name: '<host>'
        Datacenter: 'dc1'
            Server: true (bootstrap: true)
       Client Addr: 0.0.0.0 (HTTP: 8500, HTTPS: -1, DNS: 8600, RPC: 8400)
      Cluster Addr: <host_ip> (LAN: 8301, WAN: 8302)
    Gossip encrypt: false, RPC-TLS: false, TLS-Incoming: false
             Atlas: <disabled>

==> Log data will now stream in as it occurs:

    2017/06/08 03:39:44 [INFO] raft: Restored from snapshot 13-35418-1496826625488
    2017/06/08 03:39:44 [INFO] serf: EventMemberJoin: <host> <host_ip>
    2017/06/08 03:39:44 [INFO] raft: Node at <host_ip>:8300 [Follower] entering Follower state
    2017/06/08 03:39:44 [INFO] consul: adding LAN server <host> (Addr: <host_ip>:8300) (DC: dc1)
    2017/06/08 03:39:44 [INFO] serf: EventMemberJoin: <host>.dc1 <host_ip>
    2017/06/08 03:39:44 [INFO] consul: adding WAN server <host>.dc1 (Addr: <host_ip>:8300) (DC: dc1)
    2017/06/08 03:39:44 [ERR] agent: failed to sync remote state: No cluster leader
    2017/06/08 03:39:45 [WARN] raft: Heartbeat timeout reached, starting election
    2017/06/08 03:39:45 [INFO] raft: Node at <host_ip>:8300 [Candidate] entering Candidate state
    2017/06/08 03:39:45 [INFO] raft: Election won. Tally: 1
    2017/06/08 03:39:45 [INFO] raft: Node at <host_ip>:8300 [Leader] entering Leader state
    2017/06/08 03:39:45 [INFO] consul: cluster leadership acquired
    2017/06/08 03:39:45 [INFO] consul: New leader elected: <host>
    2017/06/08 03:39:45 [INFO] raft: Disabling EnableSingleNode (bootstrap)
    2017/06/08 03:39:45 [INFO] raft: Added peer <host_ip>:9300, starting replication
    2017/06/08 03:39:45 [INFO] raft: Removed peer <host_ip>:9300, stopping replication (Index: 36201)
    2017/06/08 03:39:45 [INFO] raft: Added peer <host_ip>:9300, starting replication
    2017/06/08 03:39:45 [INFO] raft: Added peer <host_ip>:10300, starting replication
    2017/06/08 03:39:45 [INFO] raft: Removed peer <host_ip>:10300, stopping replication (Index: 36228)
    2017/06/08 03:39:45 [INFO] raft: Removed peer <host_ip>:9300, stopping replication (Index: 36230)
    2017/06/08 03:39:45 [ERR] raft: Failed to AppendEntries to <host_ip>:10300: dial tcp <host_ip>:10300: getsockopt: connection refused
    2017/06/08 03:39:45 [ERR] raft: Failed to AppendEntries to <host_ip>:9300: dial tcp <host_ip>:9300: getsockopt: connection refused
    2017/06/08 03:39:45 [ERR] raft: Failed to AppendEntries to <host_ip>:9300: dial tcp <host_ip>:9300: getsockopt: connection refused
    2017/06/08 03:39:45 [ERR] raft: Failed to AppendEntries to <host_ip>:10300: dial tcp <host_ip>:10300: getsockopt: connection refused
    2017/06/08 03:39:45 [ERR] raft: Failed to AppendEntries to <host_ip>:9300: dial tcp <host_ip>:9300: getsockopt: connection refused
    2017/06/08 03:39:49 [WARN] agent: Check 'vault::8200:vault-sealed-check' missed TTL, is now critical
    2017/06/08 03:39:50 [INFO] serf: EventMemberJoin: server2 <host_ip>
    2017/06/08 03:39:50 [INFO] consul: adding LAN server server2 (Addr: <host_ip>:9300) (DC: dc1)
    2017/06/08 03:39:50 [INFO] raft: Added peer <host_ip>:9300, starting replication
    2017/06/08 03:39:50 [WARN] raft: AppendEntries to <host_ip>:9300 rejected, sending older logs (next: 36231)
    2017/06/08 03:39:50 [INFO] raft: pipelining replication to peer <host_ip>:9300
    2017/06/08 03:39:50 [INFO] consul: member 'server2' joined, marking health alive
    2017/06/08 03:39:52 [INFO] agent: Synced service 'vault::8200'
    2017/06/08 03:39:52 [INFO] agent: Synced check 'vault::8200:vault-sealed-check'
    2017/06/08 03:40:06 [INFO] agent: Synced check 'vault::8200:vault-sealed-check'
    2017/06/08 03:40:18 [ERR] raft: Failed to heartbeat to <host_ip>:9300: EOF
    2017/06/08 03:40:18 [INFO] raft: aborting pipeline replication to peer <host_ip>:9300
    2017/06/08 03:40:19 [ERR] raft: Failed to AppendEntries to <host_ip>:9300: dial tcp <host_ip>:9300: getsockopt: connection refused
    2017/06/08 03:40:19 [ERR] raft: Failed to heartbeat to <host_ip>:9300: dial tcp <host_ip>:9300: getsockopt: connection refused
    2017/06/08 03:40:19 [ERR] raft: Failed to AppendEntries to <host_ip>:9300: dial tcp <host_ip>:9300: getsockopt: connection refused
    2017/06/08 03:40:19 [ERR] raft: Failed to heartbeat to <host_ip>:9300: dial tcp <host_ip>:9300: getsockopt: connection refused
    2017/06/08 03:40:19 [ERR] raft: Failed to AppendEntries to <host_ip>:9300: dial tcp <host_ip>:9300: getsockopt: connection refused
    2017/06/08 03:40:19 [ERR] raft: Failed to AppendEntries to <host_ip>:9300: dial tcp <host_ip>:9300: getsockopt: connection refused
    2017/06/08 03:40:19 [ERR] raft: Failed to heartbeat to <host_ip>:9300: dial tcp <host_ip>:9300: getsockopt: connection refused
    2017/06/08 03:40:19 [WARN] raft: Failed to contact <host_ip>:9300 in 501.593114ms
    2017/06/08 03:40:19 [WARN] raft: Failed to contact quorum of nodes, stepping down
    2017/06/08 03:40:19 [INFO] raft: Node at <host_ip>:8300 [Follower] entering Follower state
    2017/06/08 03:40:19 [INFO] consul: cluster leadership lost
    2017/06/08 03:40:19 [ERR] raft: Failed to AppendEntries to <host_ip>:9300: dial tcp <host_ip>:9300: getsockopt: connection refused
    2017/06/08 03:40:20 [WARN] raft: Heartbeat timeout reached, starting election
    2017/06/08 03:40:20 [INFO] raft: Node at <host_ip>:8300 [Candidate] entering Candidate state
    2017/06/08 03:40:20 [ERR] raft: Failed to make RequestVote RPC to <host_ip>:9300: dial tcp <host_ip>:9300: getsockopt: connection refused
    2017/06/08 03:40:21 [INFO] memberlist: Suspect server2 has failed, no acks received
    2017/06/08 03:40:22 [WARN] raft: Election timeout reached, restarting election
    2017/06/08 03:40:22 [INFO] raft: Node at <host_ip>:8300 [Candidate] entering Candidate state
    2017/06/08 03:40:22 [ERR] raft: Failed to make RequestVote RPC to <host_ip>:9300: dial tcp <host_ip>:9300: getsockopt: connection refused
    2017/06/08 03:40:23 [INFO] memberlist: Suspect server2 has failed, no acks received
    2017/06/08 03:40:23 [WARN] dns: Query results too stale, re-requesting
    2017/06/08 03:40:23 [ERR] dns: rpc error: No cluster leader
    2017/06/08 03:40:23 [WARN] raft: Election timeout reached, restarting election
    2017/06/08 03:40:23 [INFO] raft: Node at <host_ip>:8300 [Candidate] entering Candidate state
    2017/06/08 03:40:23 [ERR] raft: Failed to make RequestVote RPC to <host_ip>:9300: dial tcp <host_ip>:9300: getsockopt: connection refused
    2017/06/08 03:40:24 [WARN] raft: Election timeout reached, restarting election
    2017/06/08 03:40:24 [INFO] raft: Node at <host_ip>:8300 [Candidate] entering Candidate state
    2017/06/08 03:40:24 [ERR] raft: Failed to make RequestVote RPC to <host_ip>:9300: dial tcp <host_ip>:9300: getsockopt: connection refused
    2017/06/08 03:40:24 [ERR] http: Request PUT /v1/session/renew/8c4efe65-07c3-f93e-6679-f2bc95f8e92c, error: No cluster leader from=172.17.0.4:57031
    2017/06/08 03:40:25 [INFO] memberlist: Suspect server2 has failed, no acks received
    2017/06/08 03:40:25 [ERR] http: Request PUT /v1/session/renew/8c4efe65-07c3-f93e-6679-f2bc95f8e92c, error: No cluster leader from=172.17.0.4:57061
    2017/06/08 03:40:26 [INFO] memberlist: Suspect server2 has failed, no acks received
    2017/06/08 03:40:26 [INFO] memberlist: Marking server2 as failed, suspect timeout reached
    2017/06/08 03:40:26 [INFO] serf: EventMemberFailed: server2 <host_ip>
    2017/06/08 03:40:26 [INFO] consul: removing LAN server server2 (Addr: <host_ip>:9300) (DC: dc1)
    2017/06/08 03:40:26 [WARN] raft: Election timeout reached, restarting election
    2017/06/08 03:40:26 [INFO] raft: Node at <host_ip>:8300 [Candidate] entering Candidate state
    2017/06/08 03:40:26 [ERR] raft: Failed to make RequestVote RPC to <host_ip>:9300: dial tcp <host_ip>:9300: getsockopt: connection refused
    2017/06/08 03:40:26 [ERR] agent: coordinate update error: No cluster leader
    2017/06/08 03:40:26 [ERR] http: Request PUT /v1/session/renew/8c4efe65-07c3-f93e-6679-f2bc95f8e92c, error: No cluster leader from=172.17.0.4:57064
    2017/06/08 03:40:27 [WARN] dns: Query results too stale, re-requesting
    2017/06/08 03:40:27 [ERR] dns: rpc error: No cluster leader
    2017/06/08 03:40:27 [WARN] raft: Election timeout reached, restarting election

consul2的日志:

==> WARNING: Expect Mode enabled, expecting 2 servers
==> Starting Consul agent...
==> Starting Consul agent RPC...
==> Consul agent running!
         Node name: 'server2'
        Datacenter: 'dc1'
            Server: true (bootstrap: false)
       Client Addr: 0.0.0.0 (HTTP: 9500, HTTPS: -1, DNS: 9600, RPC: 9400)
      Cluster Addr: <host_ip> (LAN: 9301, WAN: 9302)
    Gossip encrypt: false, RPC-TLS: false, TLS-Incoming: false
             Atlas: <disabled>

==> Log data will now stream in as it occurs:

    2017/06/08 09:09:50 [INFO] raft: Restored from snapshot 13-35418-1496892834061
    2017/06/08 09:09:50 [INFO] serf: EventMemberJoin: server2 <host_ip>
    2017/06/08 09:09:50 [INFO] serf: EventMemberJoin: server2.dc1 <host_ip>
    2017/06/08 09:09:50 [INFO] raft: Node at <host_ip>:9300 [Follower] entering Follower state
    2017/06/08 09:09:50 [INFO] consul: adding LAN server server2 (Addr: <host_ip>:9300) (DC: dc1)
    2017/06/08 09:09:50 [INFO] consul: adding WAN server server2.dc1 (Addr: <host_ip>:9300) (DC: dc1)
    2017/06/08 09:09:50 [ERR] agent: failed to sync remote state: No cluster leader
    2017/06/08 09:09:50 [INFO] agent: Joining cluster...
    2017/06/08 09:09:50 [INFO] agent: (LAN) joining: [<host_ip>:8301 <host_ip>:10301]
    2017/06/08 09:09:50 [INFO] serf: EventMemberJoin: <host> <host_ip>
    2017/06/08 09:09:50 [INFO] consul: adding LAN server <host> (Addr: <host_ip>:8300) (DC: dc1)
    2017/06/08 09:09:50 [INFO] agent: (LAN) joined: 1 Err: <nil>
    2017/06/08 09:09:50 [INFO] agent: Join completed. Synced with 1 initial agents
    2017/06/08 09:09:50 [WARN] raft: Failed to get previous log: 36233 log not found (last: 36230)
    2017/06/08 09:09:50 [INFO] raft: Removed ourself, transitioning to follower
    2017/06/08 09:09:50 [INFO] raft: Removed ourself, transitioning to follower
    2017/06/08 09:09:52 [WARN] memberlist: Was able to reach <host> via TCP but not UDP, network may be misconfigured and not allowing bidirectional UDP
==> Newer Consul version available: 0.8.3
    2017/06/08 09:09:54 [WARN] memberlist: Was able to reach <host> via TCP but not UDP, network may be misconfigured and not allowing bidirectional UDP
    2017/06/08 09:09:56 [WARN] memberlist: Was able to reach <host> via TCP but not UDP, network may be misconfigured and not allowing bidirectional UDP
    2017/06/08 09:09:57 [WARN] memberlist: Was able to reach <host> via TCP but not UDP, network may be misconfigured and not allowing bidirectional UDP

Answer 1

consul 关于双向 UDP 的意思是 consul agent 需要看到它的 consul server 和 反之亦然，领事服务器需要看到它的代理。

Consul agent -- [UDP] --> Consul Server
Consul agent <--[UDP] --  Consul Server

它们是两种不同的通信，不像 TCP，它使用代理已经启动的相同 channel 。

因此，如果您的领事代理和服务器不在同一个网络(即 docker 网络)中，您需要在两端公开端口。并考虑到 advertise 的概念这是代理宣布要联系的地址。