Zookeeper error: Cannot open channel to X at election address

Question

I have installed zookeeper in 3 different aws servers. The following is the configuration in all the servers

tickTime=2000
initLimit=10
syncLimit=5
dataDir=/         


        

Answer 1

I met the save question and solved it.

make sure the myid is the save with your configuration in the zoo.cfg.

please check your zoo.cfg file in your conf directory, which contains such content.

server.1=zookeeper1:2888:3888  
server.2=zookeeper2:2888:3888  
server.3=zookeeper3:2888:3888  

and check the myid in your server dataDir directory. For example:

let's say the dataDir defined on the zoo.cfg is '/home/admin/data'

then on zookeeper1, you must have a file named myid and have value 1 on this file ;on zookeeper2, you must have a file named myid and have value 2 on this file; on zookeeper3, you must have a file named myid and have value 3 on this file.

if not configured like this, the server will listen on a wrong ip:port.

Answer 2

Here is some ansible jinja2 template info for automating the build of a cluster with the 0.0.0.0 hostname in zoo.cfg

{% for url in zookeeper_hosts_list %}
  {%- set url_host = url.split(':')[0] -%}
  {%- if url_host == ansible_fqdn or url_host in     ansible_all_ipv4_addresses -%}
server.{{loop.index0}}=0.0.0.0:2888:3888
{% else %}
server.{{loop.index0}}={{url_host}}:2888:3888
{% endif %}
{% endfor %}

Answer 3

If your own hostname resolves to 127.0.0.1 (In my case, the hostname was in /etc/hosts), zookeeper won't start up without having 0.0.0.0 in the zoo.cfg file, but if your hostname resolves to the actual machine's IP, you can put it's own hostname in the config file.

Answer 4

This is what worked for me

Step 1:
Node 1:
zoo.cfg
server.1= 0.0.0.0:<port>:<port2>
server.2= <IP>:<port>:<port2>
.
.
.
server.n= <IP>:<port>:<port2>

Node 2 :
server.1= <IP>:<port>:<port2>
server.2= 0.0.0.0:<port>:<port2>
.
.
.
server.n= <IP>:<port>:<port2>


Now in location defined by datadir on your zoo.cfg
Node 1:
echo 1 > <datadir>/id

Node 2:
echo 2 > <datadir>/id

.
.
.


Node n:
echo n > <datadir>/id

This one helped me to start zoo keeper successfully but will know more once i start playing with it. Hope this helps.