# High Availability

**URL:** <https://dmap-community.ductus.global/t/high-availability/1626>\
**Category:** General\
**Created:** [November 2, 2017, 8:17am UTC](https://dmap-community.ductus.global/t/high-availability/1626 "2017-11-02T08:17:37Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![prabhudev](https://avatars.discourse-cdn.com/v4/letter/p/71e660/32.png) [@prabhudev](https://dmap-community.ductus.global/u/prabhudev)\
**Post date:** [November 2, 2017, 8:17am UTC](https://dmap-community.ductus.global/t/high-availability/1626/1 "2017-11-02T08:17:37Z")

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Dear Team,

I am checking the HA examples at ha/dummy started with make start(all 3 nodes has status is none).  
1)When I tried to make node1 or node2 as master always node0 is becoming master.  
Command I tried ./ctrl master node2 (verified from status node 0 master.node1 and node2 none)

1. Due to above 1) be slave not working  
./ctrl slave node0 node1 127.0.0.1  
ctrl: ctrl.c:144: beslave: Assertion `(confd\_ha\_beslave(s, &nodeid, &m, 1)) == 0’ failed.  
Aborted (core dumped)

How to make either node1 or node 2 as master.Is in code by default selecting node0 master?

Thanks and Regards  
Prabhudev

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**Author:** ![cohult](https://yyz2.discourse-cdn.com/flex010/user_avatar/dmap-community.ductus.global/cohult/32/221_2.png) [@cohult](https://dmap-community.ductus.global/u/cohult)\
**Post date:** [November 2, 2017, 11:13am UTC](https://dmap-community.ductus.global/t/high-availability/1626/2 "2017-11-02T11:13:39Z")

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If you look into the README you will find that you address the command to a port. I.e. node0 has port 4565, which is the node you will address with your command if you don’t specify a port number.  
If you want to address node1 use port 4575, node2 use port 4585.  
So for example, your “./ctrl master node2” told node0 that node0 should be master with node ID set to “node2”.  
You can verify this by doing something like:

```
$ ./ctrl -d -d ha_status
TRACE Connected (ha) to ConfD
master 2 slaves node2 node1
$ ./ctrl -p 4575 -d -d ha_status
TRACE Connected (ha) to ConfD
slave master: node0
$ ./ctrl -p 4585 -d -d ha_status
TRACE Connected (ha) to ConfD
slave master: node0

```

Instead, to set node2 to master:

```
$ ./ctrl -d -d none
TRACE Connected (ha) to ConfD
$ ./ctrl -d -d ha_status
TRACE Connected (ha) to ConfD
none
$ ./ctrl -d -d -p 4575 ha_status
TRACE Connected (ha) to ConfD
none
$ ./ctrl -d -d -p 4585 ha_status
TRACE Connected (ha) to ConfD
none
$ ./ctrl -d -d -p 4585 master node2
TRACE Connected (ha) to ConfD
$ ./ctrl -d -d -p 4575 slave node1 node2 127.0.0.1
TRACE Connected (ha) to ConfD
$ ./ctrl -d -d -d slave node0 node2 127.0.0.1
TRACE Connected (ha) to ConfD
$ ./ctrl -d -d -p 4585 ha_status
TRACE Connected (ha) to ConfD
master 2 slaves node0 node1
$ ./ctrl -d -d -p 4575 ha_status
TRACE Connected (ha) to ConfD
slave master: node2
$ ./ctrl -d -d ha_status
TRACE Connected (ha) to ConfD
slave master: node2
```

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<div class="post-metadata">

**Author:** ![prabhudev](https://avatars.discourse-cdn.com/v4/letter/p/71e660/32.png) [@prabhudev](https://dmap-community.ductus.global/u/prabhudev)\
**Post date:** [November 2, 2017, 1:38pm UTC](https://dmap-community.ductus.global/t/high-availability/1626/3 "2017-11-02T13:38:06Z")

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Thank you Conny Ohult !!!