Question

TL;博士

当启动3个kubernetes pod的新的percona群集时，grastate.dat seq_no设置为-1并且不会更改。在删除一个pod并观察它重新启动时，期望它重新加入群集，它将其初始位置设置为00000000-0000-0000-0000-000000000000:-1并尝试连接到自身（它以前的ip），可能是因为它＆＃39; d是群集中的第一个pod？然后它超时了它与自身的错误联系：

2017-03-26T08:38:05.374058Z 0 [Note] WSREP: (b7571ff8, 'tcp://0.0.0.0:4567') connection to peer 00000000 with addr tcp://10.52.0.26:4567 timed out, no messages seen in PT3S

群集无法正常启动，我无法在群集中成功重启pod。

展开

当我从头开始创建集群时。有了空白数据目录和一个新的etcd集群，一切似乎都出现了。不过，我查看了grastate.dat，发现每个广告连播的seq_no为-1：

root@gluster-3:/mnt/gfs/gluster_vol-1/mysql# cat percona-0/grastate.dat
# GALERA saved state
version: 2.1
uuid:    a91f70f2-11f8-11e7-8f3d-86c2e58790ac
seqno:   -1
safe_to_bootstrap: 0
root@gluster-3:/mnt/gfs/gluster_vol-1/mysql# cat percona-1/grastate.dat
# GALERA saved state
version: 2.1
uuid:    a91f70f2-11f8-11e7-8f3d-86c2e58790ac
seqno:   -1
safe_to_bootstrap: 0
root@gluster-3:/mnt/gfs/gluster_vol-1/mysql# cat percona-2/grastate.dat
# GALERA saved state
version: 2.1
uuid:    a91f70f2-11f8-11e7-8f3d-86c2e58790ac
seqno:   -1
safe_to_bootstrap: 0

此时我可以执行mysql -h percona -u wordpress -p并连接和wordpress也可以。

方案：我有3个percona pods

/ # jonathan@ubuntu:~/Projects/k8wp$ kubectl get pods
NAME                         READY     STATUS    RESTARTS   AGE
etcd-0                       1/1       Running   1          12h
etcd-1                       1/1       Running   0          12h
etcd-2                       1/1       Running   3          12h
etcd-3                       1/1       Running   1          12h
percona-0                    1/1       Running   0          8m
percona-1                    1/1       Running   0          57m
percona-2                    1/1       Running   0          57m

当我尝试重新启动percona-0时，它会在重新启动时被群集踢出，percona-0的gvwstate.dat文件显示

root@gluster-3:/mnt/gfs/gluster_vol-1/mysql# cat percona-0/gvwstate.dat
my_uuid: b7571ff8-11f8-11e7-bd2d-8b50487e1523
#vwbeg
view_id: 3 b7571ff8-11f8-11e7-bd2d-8b50487e1523 3
bootstrap: 0
member: b7571ff8-11f8-11e7-bd2d-8b50487e1523 0
member: bd05a643-11f8-11e7-9dab-1b4fc20eaf6a 0
member: c33d6a73-11f8-11e7-9e86-fe1cf3d3367a 0
#vwend

群集中的其他2个广告连播显示：

root@gluster-3:/mnt/gfs/gluster_vol-1/mysql# cat percona-1/gvwstate.dat
my_uuid: bd05a643-11f8-11e7-9dab-1b4fc20eaf6a
#vwbeg
view_id: 3 bd05a643-11f8-11e7-9dab-1b4fc20eaf6a 4
bootstrap: 0
member: bd05a643-11f8-11e7-9dab-1b4fc20eaf6a 0
member: c33d6a73-11f8-11e7-9e86-fe1cf3d3367a 0
#vwend
root@gluster-3:/mnt/gfs/gluster_vol-1/mysql# cat percona-2/gvwstate.dat
my_uuid: c33d6a73-11f8-11e7-9e86-fe1cf3d3367a
#vwbeg
view_id: 3 bd05a643-11f8-11e7-9dab-1b4fc20eaf6a 4
bootstrap: 0
member: bd05a643-11f8-11e7-9dab-1b4fc20eaf6a 0
member: c33d6a73-11f8-11e7-9e86-fe1cf3d3367a 0
#vwend

以下是我认为来自percona-0创业公司的相关错误：

2017-03-26T08:37:58.370605Z 0 [Note] WSREP: Setting initial position to 00000000-0000-0000-0000-000000000000:-1
2017-03-26T08:37:58.372537Z 0 [Note] WSREP: gcomm: connecting to group 'wordpress-001', peer '10.52.0.26:'
2017-03-26T08:38:01.373345Z 0 [Note] WSREP: (b7571ff8, 'tcp://0.0.0.0:4567') connection to peer 00000000 with addr tcp://10.52.0.26:4567 timed out, no messages seen in PT3S
2017-03-26T08:38:01.373682Z 0 [Warning] WSREP: no nodes coming from prim view, prim not possible
2017-03-26T08:38:01.373750Z 0 [Note] WSREP: view(view_id(NON_PRIM,b7571ff8,5) memb {
    b7571ff8,0
} joined {
} left {
} partitioned {
})
2017-03-26T08:38:01.373838Z 0 [Note] WSREP: gcomm: connected
2017-03-26T08:38:01.373872Z 0 [Note] WSREP: Changing maximum packet size to 64500, resulting msg size: 32636
2017-03-26T08:38:01.373987Z 0 [Note] WSREP: Shifting CLOSED -> OPEN (TO: 0)
2017-03-26T08:38:01.374012Z 0 [Note] WSREP: Opened channel 'wordpress-001'
2017-03-26T08:38:01.374108Z 0 [Note] WSREP: Waiting for SST to complete.
2017-03-26T08:38:01.374417Z 0 [Note] WSREP: New COMPONENT: primary = no, bootstrap = no, my_idx = 0, memb_num = 1
2017-03-26T08:38:01.374469Z 0 [Note] WSREP: Flow-control interval: [16, 16]
2017-03-26T08:38:01.374491Z 0 [Note] WSREP: Received NON-PRIMARY.
2017-03-26T08:38:01.374560Z 1 [Note] WSREP: New cluster view: global state: :-1, view# -1: non-Primary, number of nodes: 1, my index: 0, protocol version -1

尝试连接到10.52.0.26中的2017-03-26T08:37:58.372537Z 0 [Note] WSREP: gcomm: connecting to group 'wordpress-001', peer '10.52.0.26:'的ip实际上是pod之前的ip，这里是删除percona-0之前我在etcd中的键列表

/ # etcdctl ls --recursive
/pxc-cluster
/pxc-cluster/wordpress
/pxc-cluster/queue
/pxc-cluster/queue/wordpress
/pxc-cluster/queue/wordpress-001
/pxc-cluster/wordpress-001
/pxc-cluster/wordpress-001/10.52.1.46
/pxc-cluster/wordpress-001/10.52.1.46/ipaddr
/pxc-cluster/wordpress-001/10.52.1.46/hostname
/pxc-cluster/wordpress-001/10.52.2.33
/pxc-cluster/wordpress-001/10.52.2.33/ipaddr
/pxc-cluster/wordpress-001/10.52.2.33/hostname
/pxc-cluster/wordpress-001/10.52.0.26
/pxc-cluster/wordpress-001/10.52.0.26/hostname
/pxc-cluster/wordpress-001/10.52.0.26/ipaddr

kubectl删除pods / percona-0后：

/ # etcdctl ls --recursive
/pxc-cluster
/pxc-cluster/queue
/pxc-cluster/queue/wordpress
/pxc-cluster/queue/wordpress-001
/pxc-cluster/wordpress-001
/pxc-cluster/wordpress-001/10.52.1.46
/pxc-cluster/wordpress-001/10.52.1.46/ipaddr
/pxc-cluster/wordpress-001/10.52.1.46/hostname
/pxc-cluster/wordpress-001/10.52.2.33
/pxc-cluster/wordpress-001/10.52.2.33/ipaddr
/pxc-cluster/wordpress-001/10.52.2.33/hostname
/pxc-cluster/wordpress

同样在重启期间，percona-0尝试注册到etcd：

{"action":"create","node":{"key":"/pxc-cluster/queue/wordpress-001/00000000000000009886","value":"10.52.0.27","expiration":"2017-03-26T08:38:57.980325718Z","ttl":60,"modifiedIndex":9886,"createdIndex":9886}}
{"action":"set","node":{"key":"/pxc-cluster/wordpress-001/10.52.0.27/ipaddr","value":"10.52.0.27","expiration":"2017-03-26T08:38:28.01814818Z","ttl":30,"modifiedIndex":9887,"createdIndex":9887}}
{"action":"set","node":{"key":"/pxc-cluster/wordpress-001/10.52.0.27/hostname","value":"percona-0","expiration":"2017-03-26T08:38:28.037188157Z","ttl":30,"modifiedIndex":9888,"createdIndex":9888}}
{"action":"update","node":{"key":"/pxc-cluster/wordpress-001/10.52.0.27","dir":true,"expiration":"2017-03-26T08:38:28.054726795Z","ttl":30,"modifiedIndex":9889,"createdIndex":9887},"prevNode":{"key":"/pxc-cluster/wordpress-001/10.52.0.27","dir":true,"modifiedIndex":9887,"createdIndex":9887}}

哪个不起作用。

来自群集的第二个成员percona-1：

2017-03-26T08:37:44.069583Z 0 [Note] WSREP: (bd05a643, 'tcp://0.0.0.0:4567') turning message relay requesting on, nonlive peers: tcp://10.52.0.26:4567 
2017-03-26T08:37:45.069756Z 0 [Note] WSREP: (bd05a643, 'tcp://0.0.0.0:4567') reconnecting to b7571ff8 (tcp://10.52.0.26:4567), attempt 0
2017-03-26T08:37:48.570332Z 0 [Note] WSREP: (bd05a643, 'tcp://0.0.0.0:4567') connection to peer 00000000 with addr tcp://10.52.0.26:4567 timed out, no messages seen in PT3S
2017-03-26T08:37:49.605089Z 0 [Note] WSREP: evs::proto(bd05a643, GATHER, view_id(REG,b7571ff8,3)) suspecting node: b7571ff8
2017-03-26T08:37:49.605276Z 0 [Note] WSREP: evs::proto(bd05a643, GATHER, view_id(REG,b7571ff8,3)) suspected node without join message, declaring inactive
2017-03-26T08:37:50.104676Z 0 [Note] WSREP: declaring c33d6a73 at tcp://10.52.2.33:4567 stable

新信息： 我再次重新启动了percona-0，这次它以某种方式出现了！经过几次尝试后，我意识到pod需要重新启动两次才会出现，即第一次删除它后，它会在上次错误后再次出现错误，第二次出现就好并与其他成员同步。这可能是因为它是集群中的第一个pod吗？

我已经测试过删除其他广告连播，但它们都恢复正常。

问题只在于percona-0。

也; 如果我的节点崩溃，那么立刻取下所有的吊舱，这就是吊舱根本不会恢复的情况！我怀疑它是因为没有状态保存到grastate.dat，即seq_no保持-1，即使全局id可能改变，pods以mysqld shutdown退出，并出现以下错误：

jonathan@ubuntu:~/Projects/k8wp$ kubectl logs percona-2 | grep ERROR
2017-03-26T11:20:25.795085Z 0 [ERROR] WSREP: failed to open gcomm backend connection: 110: failed to reach primary view: 110 (Connection timed out)
2017-03-26T11:20:25.795276Z 0 [ERROR] WSREP: gcs/src/gcs_core.cpp:gcs_core_open():208: Failed to open backend connection: -110 (Connection timed out)
2017-03-26T11:20:25.795544Z 0 [ERROR] WSREP: gcs/src/gcs.cpp:gcs_open():1437: Failed to open channel 'wordpress-001' at 'gcomm://10.52.2.36': -110 (Connection timed out)
2017-03-26T11:20:25.795618Z 0 [ERROR] WSREP: gcs connect failed: Connection timed out
2017-03-26T11:20:25.795645Z 0 [ERROR] WSREP: wsrep::connect(gcomm://10.52.2.36) failed: 7
2017-03-26T11:20:25.795693Z 0 [ERROR] Aborting
jonathan@ubuntu:~/Projects/k8wp$ kubectl logs percona-1 | grep ERROR
2017-03-26T11:20:27.093780Z 0 [ERROR] WSREP: failed to open gcomm backend connection: 110: failed to reach primary view: 110 (Connection timed out)
2017-03-26T11:20:27.093977Z 0 [ERROR] WSREP: gcs/src/gcs_core.cpp:gcs_core_open():208: Failed to open backend connection: -110 (Connection timed out)
2017-03-26T11:20:27.094145Z 0 [ERROR] WSREP: gcs/src/gcs.cpp:gcs_open():1437: Failed to open channel 'wordpress-001' at 'gcomm://10.52.1.49': -110 (Connection timed out)
2017-03-26T11:20:27.094200Z 0 [ERROR] WSREP: gcs connect failed: Connection timed out
2017-03-26T11:20:27.094227Z 0 [ERROR] WSREP: wsrep::connect(gcomm://10.52.1.49) failed: 7
2017-03-26T11:20:27.094247Z 0 [ERROR] Aborting
jonathan@ubuntu:~/Projects/k8wp$ kubectl logs percona-0 | grep ERROR
2017-03-26T11:20:52.040214Z 0 [ERROR] WSREP: failed to open gcomm backend connection: 110: failed to reach primary view: 110 (Connection timed out)
2017-03-26T11:20:52.040279Z 0 [ERROR] WSREP: gcs/src/gcs_core.cpp:gcs_core_open():208: Failed to open backend connection: -110 (Connection timed out)
2017-03-26T11:20:52.040385Z 0 [ERROR] WSREP: gcs/src/gcs.cpp:gcs_open():1437: Failed to open channel 'wordpress-001' at 'gcomm://10.52.2.36': -110 (Connection timed out)
2017-03-26T11:20:52.040437Z 0 [ERROR] WSREP: gcs connect failed: Connection timed out
2017-03-26T11:20:52.040471Z 0 [ERROR] WSREP: wsrep::connect(gcomm://10.52.2.36) failed: 7
2017-03-26T11:20:52.040508Z 0 [ERROR] Aborting

grastate.dat删除所有广告连播：

root@gluster-3:/mnt/gfs/gluster_vol-1/mysql# cat percona-0/grastate.dat
# GALERA saved state
version: 2.1
uuid:    a91f70f2-11f8-11e7-8f3d-86c2e58790ac
seqno:   -1
safe_to_bootstrap: 0
 root@gluster-3:/mnt/gfs/gluster_vol-1/mysql# cat percona-1/grastate.dat
# GALERA saved state
version: 2.1
uuid:    a91f70f2-11f8-11e7-8f3d-86c2e58790ac
seqno:   -1
safe_to_bootstrap: 0
 root@gluster-3:/mnt/gfs/gluster_vol-1/mysql# cat percona-2/grastate.dat
# GALERA saved state
version: 2.1
uuid:    a91f70f2-11f8-11e7-8f3d-86c2e58790ac
seqno:   -1
safe_to_bootstrap: 0

不，gvwstate.dat

Answer 1

通过将容器中的入口点更改为以下脚本来修复它：

#!/bin/bash
sed -i \"s|safe_to_bootstrap.*:.*|safe_to_bootstrap:1|1\" /var/lib/mysql/grastate.dat; 
/entrypoint.sh --wsrep-new-cluster;

感谢https://www.claudiokuenzler.com/blog/494/galera-cluster-mysql-not-starting-failed-to-open-channel-reach-primary#.WNesDiF97Qo

问题是，当从崩溃中重新启动3个pod时，它们都会出现以下错误：

[ERROR] WSREP: failed to open gcomm backend connection: 110: failed to reach primary view: 110 (Connection timed out)

这意味着（从链接中总结），因为所有pod都在第一个pod下（pod由statefulset管理）出现并尝试重新连接到群集但是找不到它可以连接到的任何其他pod，所以它下降，下一个pod出现尝试同样的事情，遇到相同的错误并下降到等等

解决方案是让第一个pod在启动时启动新群集，然后所有后续群集都会出现并找到要连接的节点。它仍然会提供所有数据。

使用percona xtradb，docker容器的入口点如下所示：

exec mysqld --user=mysql --wsrep_cluster_name=$CLUSTER_NAME --wsrep_cluster_address="gcomm://$cluster_join" --wsrep_sst_method=xtrabackup-v2 --wsrep_sst_auth="xtrabackup:$XTRABACKUP_PASSWORD" --log-error=${DATADIR}error.log $CMDARG

所以我需要做的就是让设置运行，将早期的参数--wsrep-new-cluster传递给/entrypoint.sh文件，如下所示：

/entrypoint.sh --wsrep-new-cluster

<强> PS // 我一开始尝试了上面的内容，但是我遇到了一个错误，说明要强制使用该节点强制新的集群和引导程序，我必须在safe_to_bootstrap

中将/var/lib/mysql/grastate.dat从0设置为1

Percona mysql xtradb群集无法正常启动，节点重启无法正常工作

1 个答案: