I found one documentation here to run multiple node application on single port using proxypass, I understood the concept, it just forward the request to node application port unsing ProxyPass. In that example, they used httpd, and I am using tomcat.
My question is, how can I do same configuration in tomcat?
simply I am expecting tomcat configuration for this httpd configuration.
ProxyPass /node http://host.xyz.com:3000
You really should consider using Apache httpd (or any other frontend) for this purpose. This is the software that handles the requirement best - and tomcat best serves application data.
Also, Apache httpd knows how to handle port 80 or 443, something that needs some extra work with tomcat (if you don't want to run it as root. And you actually don't want to run it as root)
It doesn't require so many extra resources, use the appropriate tool for the job. And, when you use mod_proxy, look up all the related options and understand what they're there for. You probably also want ProxyPreserveHost On, but I'll stop here.
I hope the document will be helpful.
Related
I have already installed an Apache HTTP server in my RedHat system, now I need to install a Bitnami application package which contains another Apache. So I am wondering how to make them not disturbing each other?
I guess I need to configure different ports for the two HTTP server. But what if one has 8080 and another has 9090, will we visit http://[ServerName]:8080/something.html and http://[ServerName]:9090/something.html? I think this way is quite inconvenient. Am I wrong or any better idea?
My advice would be to do something like this.
Have one Apache instance listen in port 80 and the other one in port 8080 for example. The Apache instance that listens in port 80 can act as a proxy to the other Apache (port 8080) using the ProxyPass and ProxyPassReverse directives.
https://httpd.apache.org/docs/2.4/mod/mod_proxy.html
You would need to define prefixes or virtual hosts and inside them add ProxyPass directives.
I don't know to what kind of user those applications are targeted to but the usual end-user is not used to enter ports when browsing the web.
If you like to use the ports, go for it, but I would recommend using Name-based Virtual Host
so you could use different domains or subdomains to each application.
In addition to the example provided by the docs (in where they just point to different folders) in this digitalocean page they document how to make redirects to different urls.
I completely agree with EndermanAPM that usual end-user is not used to enter ports when browsing the web. Therefore, I would only allow port 80 to be accessed by the end-users.
Additional to the current solutions I see another one:
avoid messing up the settings of the Apache servers in order to not end-up with some malfunctions of your websites
leave the Apache servers listen on their designated ports (8080 respectively 9090)
install a dedicated proxy in front of the Apache servers. The proxy would listen on port 80 and would define redirect rules that would parse the request and would redirect it to the proper Apache server. (see the attached picture)
I recommend you HA Proxy. It is a very fast and reliable http and tcp proxy. I've been using it in production for years, in front of application servers, web servers and even database servers. Once you get used with its syntax, it is pretty easy to use.
I am aware that introducing a new component into the equation might add another source of potential issues. But I think that the architecture is cleaner. Besides, the two Apache servers will not be disturbing each other as you requested. You can shut down any one of the two and the other one would properly work further.
What apache module would fit better to build the following cluster:
2x Red Hat each has a tomcat an apache.
No Scalability needs.
High availability needs.
Session replication needs.
DNS
|
Load Balancer
/ \
APACHE1 APACHE2
TOMCAT1 TOMCAT2
The question is regarding what module to use for the load balancing with apache?
mod_proxy
mod_cluster
other?
If I understand mod_cluster correctly, it must be used with JBoss, or with a modified Tomcat. So if you are using plain-old Tomcat (or TomEE), then I think mod_cluster is out.
The easiest out-of-the box option is to use mod_proxy with either the AJP or HTTP back-end. If you are comfortable building additional modules, mod_jk is available from the Tomcat folks and offers a few advantages over mod_proxy, though mod_proxy has nearly achieved feature-parity.
Your diagram suggests that a load-balancer will be choosing between two httpd instances which are coupled directly to a single Tomcat instance each. In that scenario, httpd is not performing any load-balancing at all (the lb is doing the work), and so httpd might be superfluous in that configuration.
If you instead want to cross-link both httpds with both Tomcats, that's when you start having to configure cluster-like behavior with mod_proxy's "balancer" configurations. It would look something like this:
<Proxy balancer://appA>
BalancerMember http://tomcatA:8080/appA
BalancerMember http://tomcatB:8380/appA
</Proxy>
ProxyPass /appA balancer://appA
ProxyPassReverse /appA balancer://appA
There are tons of options for mod_proxy that you should read about and apply to suit your configuration. You can configure things like sticky-sessions, hot-standbys (not present in your example diagram but a good idea if you really need HA), and asymmetric load-balancing.
I have an Apache httpd and a Tomcat server connected together using mod_proxy.
I need to add both a ProxyPass and ProxyPassReverse to my httpd.conf and vhost.conf for each of my REST-style functions to configure the reverse proxy.
Is there any possibility to configure these dynamically?
You can't really dynamically-configure mod_proxy, nor would you want to do so, because you want the configuration to stay on the disk so you can reload it, survive server restarts, etc.
What you could do is include a separate file (or whole directory) each of which contains the configuration for a single function. You could have your build process auto-generate the configuration file(s) for all your functions. Just place those files in the right places and reload Apache httpd.
I have a server with several services running. One of them is accessible through the domain name like "https://www.foo.bar". Two other services are running on specific ports. So they are accessible through "https://www.foo.bar:1234".
Is it able to configure an apache2 server in a specific way, so it uses always the port 443 but with a different URL like "https://www.foo.bar/service1"?
Try ProxyPass, what you describe is a special case of a setup called Reverse Proxy: your httpd forwards requests to the other service and returns the answers to the client. (The other service happens to run on the same machine in your case, but it needn't. A simple kind of backend load-balancing can also be done this way.)
<Location /service1>
ProxyPass https://localhost:1234
ProxyPassReverse https://localhost:1234
</Location>
Be careful that your other service needs some rudimentary support for this kind of setup: if it returns HTML pages with links in it, it can't assume anymore that https://www.foo.bar:1234/foo/bar.html is the correct URL to tell the client. httpd will not look into the returned content and rewrite it for you.
I realize this question has probably been asked numerous times, but I have not been able to find a good, up-to-date answer. The only guide I have been able to find was from 2005 and was on tomcat 5. It seems a lot of the OS paths have changed.
Our situation is this:
We want to run multiple instances of tomcat 7 on a single server. Each tomcat serves up a different address. For instance, www.oursite.com should be served from a separate tomcat than test.oursite.com. So, for example the base tomcat installtion will sit in /opt/tomcat/ and the instance specific directories (this is what I could make out from that old tutorial) will be in /home/user1/some/path/ and /home/user2/some/path so that everything is seperated nicely.
Can anyone point to a good tutorial, or maybe explain here the steps to set this up? I'm a bit new to apache setups.
Are there any advantages / drawbacks to doing it this way? Would a single tomcat instance be better? We need to be able to bring down sites one at a time without influencing each other. Also, our DNS provider prevents us from setting up stealth redirects, so we have to go through apache to have nice URLs rather than redirecting straight to the tomcats.
Thanks
I believe you have 2 questions here:
How to run multiple tomcat instances in the same server and should
you?
How to configure apache httpd to do virtual host and front
tomcat?
For 1. The following is a very good tutorial on how to run multiple tomcat instances in the same server: http://java.dzone.com/articles/running-multiple-tomcat, but should you? the answer is "it depends". If you have a super powerful box and it is under utilized, you should. It also depends on what type of application you runs for each individual sites. It will definitely help you "bring down sites one at a time without influencing each other". With apache httpd configuration which I will explain in the next section, you can also run the each site on separate machines (physical or vm).
For 2. In you case, you just need to configure apache httpd to do virtual host and use ajp to connect to tomcat.
<VirtualHost *:80>
ServerName www.oursite.com
ProxyPass / ajp://tomcat.oursite.com:8009/www retry=5
ProxyPassReverse / ajp://tomcat.oursite.com:8009/www
</VirtualHost>
<VirtualHost *:80>
ServerName test.oursite.com
ProxyPass / ajp://tomcat.oursite.com:8010/test retry=5
ProxyPassReverse / ajp://tomcat.oursite:8010/test
</VirtualHost>
In the above configuration, you need to configure DNS entries of both www.yoursite.com and test.yoursite.com to point to the same host. It also assume you run both your www and test webapps on different tomcat instances on the same host tomcat.oursite.com, one on ajp port 8009 and the other one on ajp port 8010. You can also change it to a different server of its own. It's very flexible. FYI, following is how to configure ajp in tomcat: http://tomcat.apache.org/tomcat-6.0-doc/config/ajp.html
I found a problem with the apache mod_proxy_ajp connector in such a configuration, it absolutely won't allow you to use any other port when setting up multiple virtual hosts each with its own tomcat instance.
Having spent some time ruling out port conflicts, tomcat configuration issues, firewall issues I have concluded that ProxyPass and ProxyPassReverse will not work when using any port other than 8009 by default.
The solution is likely to be to switch to mod_jk, which also solves problems seen in mod_proxy_ajp with basic configurations not loading or rewriting urls embedded within tomcat hosted pages without extensive configuration changes if the tomcat instance is rooted to a subdirectory. This doesn't seem to happen with Mod_Jk