We have a number of (developer) existDb database servers, and some staging/production servers.
Each have their own configuration, that are slightly different.
We need to select which configuration to load and use in queries.
The configuration is to be stored in an XML file within the repository.
However, when syncing the content of the servers, a single burnt-in XML file is not sufficient, since it is overwritten during copying from the other server.
For this, we need the physical name of the actual database server.
The only function found, request:get-server-name that is not quite stable since a single eXist server can be accessed through a number of various (localhost, intranet or external) URLs. However, that leads to unnecessary duplication of the configuration, one for each external URL...
(Accessing some local files in the file system is not secure and not fast.)
How to get the physical name of the existDb server from XQuery?
I m sorry but I don't fully understand your question, are you talking about exist's default conf.xml or your own configuration file that you need to store in a VCS repo? Should the xquery be executed on one instance and trigger an event in all others, or just some, or...? Without some code it is difficult to see why and when something gets overwritten.
you could try console:jmx-token which does not vary depending on URL (at least it shouldn't)
Also you might find it much easier to use a docker based approach. Either with multiple instances coordinated via docker-compose or to keep the individual configs from not interfering with each other when moving from dev to staging to production https://github.com/duncdrum/exist-docker
If I understand correctly, you basically want to be able to get the hostname or the IP address of a server from XQuery. If the functions in the XQuery Request module are not doing as you wish, then another option would be to set a Java System Property when starting eXist-db. This system property could be the internal DNS name or IP of your server, for example: -Dour-server-name=server1.mydomain.com
From XQuery you could then read that Java System property using util:system-property("our-server-name").
Related
I need to install multiple iDempiere instances in one server. The customized packages are different in build and the db they are using. Is there any way to deploy both of it in one server and access like localhost:8080/client1, localhost:8080/client2 . Any help appreciated.
When I want to reference several application servers I need to copy the path of various installations
and change the database name and port of each application :
/opt/idempiere-server-production/ (on port 8080 for example) for production
And
/opt/idempiere-server-test/ (on port 8081 for example) for test
the way you said is not possible, because the idempiere server for webapp is known as
http://hostname:port/webui
Running multiple instances of idempiere on a single server is not too difficult.
Here is what you need to take care of:
Install the instances into different directories. The instances do not need to share any common files. So you are just fine making a full installation for each instance.
Make sure each instance uses its own data base. Use different names for the instance data bases.
Make sure the idempiere server instances use different tcp ports.
If you really should need to use a single port to access all of the instances you could use a http server like apache or ngnix to do define virtual hosts. Proxying or use of rewrite rules will then allow you to do the desired redirections. (I am using subdomains and apache mod_proxy to do the job)
There is another benefit to using subdomains for browser access: If all your server instances use the same host name the client browser will sometimes not be able to keep cookies from different instances apart, which can lead to a blocked session as discussed here in the idempiere google group.
Use different DB user names. The docs advise not to change the default user name Adempiere and this is ok for a single instance installation. Still if you use a single DB user for all of your instances you will run into trouble once you need to restore a database from a backup file. The RUN_DBRestore.sh will delete and recreate the DB user which is not possible when the user owns more than one DB.
You can run all of your instances as services in parallel. Before the installation of another instance rename the service script: sudo mv /etc/init.d/idempiere /etc/init.d/idempiere-theInstance. Of course you will need to do some book keeping work wth the service controller of your OS to ensure that the renamed services are started as desired.
The service controller talks to the iDempiere server via the OSGI console. For this to work without problems in a multi instance environment you need to assign a different telnet port number to each of the instances: in the editor of your choice open the file /etc/init.d/iDempiere. Find the line export TELNET_PORT=12612 and change the port number to something else.
Please Note:
OS specific descriptions in this guide are for Ubuntu 16/18 or Debian, if on another OS you need to do some research.
I have been using the described approach to host idempiere versions 5 and 6 for some time now and did not have any problems so far. Still make sure you do your own thorough tests if you want to go that route.
If you run into any problems (and maybe even manage to solve them) please report back to the community. (by giving your own answer to this question or by posting to the idempiere google group) Thanks!
You can have as many setups on your server as you like. When you run the setup to create your properties, simply chose other web ports for each installation. You also may need to slightly change the webservers configuration if they have some default ports.
The task is to have an Oracle report generated daily, automatically, and e-mailed to a user.
So I've sort of got this working (it works if I hardcode one of the reports server names below).
I created a job on the database that will generate the report. I'm able to get the report to email as a PDF to the destination with this command:
UTL_HTTP.REQUEST('http://server/reports/rwservlet?server=specific_report_server &report='||p_report_name||'&userid='||p_connstring||'&destype=mail'||p_parameters||'&desname='||p_to_recipientlist||' &cc='||p_cc_recipientlist||'&bcc='||p_bcc_recipientlist||'&subject=%22' || REPLACE(p_subject,' ','%20') || '%22¶mform=no&DESformat=pdf&ENVID='||p_envid);
That works great...
The problem however is that my organization has two report servers that are load balanced. Our server team could take down one of the servers without really any warning, so I can't just hardcode the report server name (the ?server= parameter above) with one of the report server names because it will work for a while, then when that server goes down, it will stop working.
My server team asked me to look for a way to pull the server from the formsweb.cfg file or from default.env value within the job (there are parameters in there that hold the server name). The idea there is that the "http://server" piece will direct the report to be run on the appropriate server, and the first part of the job could get the reports server name from the config file that the report is run on. I'm not sure if this is possible from the database level, or how to do this. Any ideas?
Is there a better way that this can be done, perhaps?
If there are two load-balanced servers, that strongly implies that the network folks must have configured some sort of virtual IP (VIP) for the service. You (and everyone else) should be using that VIP rather than a specific server name.
For example, if you have two servers reportA.yourdomain.com and reportB.yourdomain.com, you would almost certainly create a VIP for reports.yourdomain.com that load balances between the two servers (and knows whether one of the servers is down or whether a new reportC server has been added). This VIP would either do the load balancing itself or would point to an actual physical load balancer that distributes the traffic. All applications would reference the reports.yourdomain.com VIP rather than any hard-coded server names.
I have an rspec testsuite that I use to test our internal and public facing API. Usually all I have to do to test the service is setup my parameters (e.g test urls) and from there the tests connect to the required service and do their thing.
My question is, how to I get ruby to honor my host file entries? In this specific scenario I'm trying to hit our pre-live servers, which use the same urls as our live environment, but obviously are on an entirely different IP cluster.
Unless you are doing some very low-level stuff, Ruby will not perform DNS name resolution by itself, it will simply call the appropriate OS API. So, you need to figure out how to configure your operating system to use a local hosts file.
I've an application running on a dev server and connecting to a dev-db hosting an oracle instance.
Now i'm deploying the on a prod/prod-db machine
Since the dev-db url is hardcoded inside the java code, the just-copied binaries still points to dev-db. As a quick warkaround i added a line in Windows Host file on prod so that dev-db now points to prod-db IP address. It's work, but i'm not very satisfied of this global-scope solution.
I was wondering if exits a way to make a hosts file "private" for a certain environments ie. only valid in the scope of my running application
No, there's no way to do this, and it's a bad approach anyway.
You should instead fix the real problem, which is the hard-coding of the address inside your java code. Put such things in a properties file, and use a different properties file for production.
I'm working on building out a standard set of configurations for our cache clusters within App Fabric. My goal is to have a repeatable cache settings configuration when we load up a new environment (so server names are different, number of hosts, and other environmental factors).
My initial pass was to utilize the XML available from Export-CacheClusterConfig and simply change server names and size attributes in the <hosts> section, but I'm not sure what else is automatically registered with those values (the hostId parameter, for example).
My next approach that I've considered is a PowerShell script to simply build up the various caches with the correct parameters passed in that would simply run as a post-deploy step.
Anyone else have experience with repeatable AppFabric cache cluster deployments?
After trying both, the more successful option seems to be a combination of two factors. Management of the Cache Cluster (host information) is primarily an operations concern and is managed best by the operations team (i.e. those guys that read Server Fault). Since this information is stored in the configuration as well (and would require an XML file obtained from Export-CacheClusterConfig for each environment) it's best left to the operations team on how they want to manage it. Importing the wrong file (with the incorrect host information) has led to a number of issues.
So, we're left with PowerShell scripts. Here's a sample that I have. It could be cleaned up (check for Cache existence first) but you get the general idea. It's also much easier to store in source control (as it's just one file).
New-Cache -CacheName CRMTickets -Eviction None -Expirable false -NotificationsEnabled true
New-Cache -CacheName ConsultantCache -Eviction Lru -Expirable true -TimeToLive 60
New-Cache -CacheName WorkitemCache -Eviction None -Expirable true -TimeToLive 60