I am moving one application from server to docker in Azure infra. How to map jgroup_bind_addr for ever changing pod ip?
<TCP bind_port="${jgroups.bind_port}"
bind_addr="${jgroups.bind_addr}"
>
By default, Infinispan images bind to SITE_LOCAL which mean "Picks a site local IP address, e.g. from the 192.168.0.0 or 10.0.0.0 address range"
In the JGroups Configuration you can check other possible values available for bind_addr. Look for The following special values are also recognized for bind_addr after the table.
Related
I have several docker containers with some web applications running via docker compose. One of the containers is a custom DNS server with Bind and Webmin installed. Webmin gives a nice web UI allowing me to update Bind DNS configuration without directly modifying the files or SSHing into the container. I have docker setup to lookup DNS in this order:
my docker dns server
my companies internal dns server
google dns server
I have one master zone file for top level domain "example.com" defined in dns server 1. I added an address for server1.example.com and dns resolves correctly. I want other subdomains to be resolved from my companies internal dns server.
server1.example.com - resolves correctly
server2.example.com - this host is not referenced in the zone file for docker dns server. I would like to somehow delegate this to my companies dns server (server 2)
The goal is I should be able to do software development for web applications and deploy them on my docker containers. The code makes internal calls to other "example.com" hosts. I want some of those calls to get directed back to other docker containers rather than the real server because I am developing code on both and want to test it end to end.
I don't want to (and can't) modify my companies dns configuration. I am not an expert in bind or dns setup and looking for the simplest solution.
What configuration can achieve this?
I guess the workaround is to use fully qualified name when creating the zone file. Instead of creating a master zone example.com and listing server1 inside that zone I am creating a master zone with server1.example.com. It means I have to create a zone file for every server but I guess its ok to manage with a smaller number of hosts. server2.example.com then doesnt fall inside of a zone and gets resolved using the next dns server in the chain.
I have a container called web, it contains my application and apache webserver. When I put to browser address 0.0.0.0:8090 i get my working application. But i need to change this address to mastery.local. How do I do that without using /etc/hosts file.
This can only be achieved via DNS resolution.
The simplest way would be to add this entry to the /etc/hosts.
As an alternative you could setup an dedicated DNS server on your machine which resolves this address to 0.0.0.0 and then configure your machine to use this DNS server.
The new version of Docker (version 1.10) includes a DNS server to pass alias information from other hosts on the same network. There used to be hosts file entries for resolving linked containers (or containers on the same network). I am wondering if it is possible to use this embedded DNS server on an overlay network? I have looked in the documentation (and in issues) and cannot find information about this.
So the way the new embedded DNS "server" works is that it isn't a formal server. It's just an embedded listener for traffic to 127.0.0.11:53 (udp of course). When docker sees that query traffic on the container's network interface, it steps in with its embedded DNS server and replies with any answers it might have to the query. The documentation has some options you can set to affect how this DNS server behaves, but since it only listens for query traffic on that localhost address, there is no way to expose this to an overlay network in the way that you are thinking. However this seems to be a moving target, and I have seen this question before in IRC, so it may one day be the case that this embedded DNS server at least becomes pluggable, or possibly exposable in the way you would like.
im running windows 7 as host and ubuntu 11.04 as guest.
Which would be the best way to access a webserver on a guest from host via a defined url
(and vise versa)
e.g http://myvirtualbox and http://myhost
For now i have configured a network bridge, but the guest is gets a different ip assigned everytime. A simple solution would be to assign a staic ip and configure a name resolution localy on each machine, but maybe there is an other way (internal netwok perhaps?)
You can modify the hosts file on machines to map the hostname to the IP addresses of the machines (and change their IP addresses to static).
Or another more flexible (more hosts, faster integration for new machines) option: you're going to want to set up a DNS service, configure the machines to work with it, then add the IP of the DNS as a name server in your network adapter for the hosts to use.
That will be a more flexible, maintainable and scalable solution.
From the looks of it though, if you want a 10 minute fix, go for the first option. There are lots of tutorials on it.
I m trying setup a cassandra cluster as a test bed but gave the JMX remote connection error. I seem to found the answer for my error from cassandra FAQ page
Nodetool says "Connection refused to host: 127.0.1.1" for any remote host. What gives?
Nodetool relies on JMX, which in turn relies on RMI, which in turn sets up it's own listeners and connectors as needed on each end of the exchange. Normally all of this happens behind the scenes transparently, but incorrect name resolution for either the host connecting, or the one being connected to, can result in crossed wires and confusing exceptions.
If you are not using DNS, then make sure that your /etc/hosts files are accurate on both ends. If that fails try passing the -Djava.rmi.server.hostname=$IP option to the JVM at startup (where $IP is the address of the interface you can reach from the remote machine).
But can somebody help me on how to do -Djava.rmi.server.hostname=$IP
Or what to add is hosts file, i know that in hosts normally we add "IP Alias", but whose ip and alias.
I dont know much java or either linux
I m currently working on ubuntu v10.04 and cassandra v0.74
Sudesh
For JMX you need to enable JMX-remoting:
java -Dcom.sun.management.jmxremote
Depending on from where you want to access the jmx-server, you also need to specify a port:
-Dcom.sun.management.jmxremote.port=12345
and set or disable passwords.
Have a look at http://download.oracle.com/javase/1.5.0/docs/guide/management/agent.html for more details.