I am running a snmpsimd.py command with a specific ip and port and a data directory.But i am not getting any response?
how to have multiple agents?
When we are specifying data directory how to separates which snmprec file belongs to which agents?
Take a look at snmpsimd startup logging - it should note all data files it finds and which SNMP v1/v2c community corresponds to each of them.
In general, each data file path (relative to the data directory) serves as SNMP community or SNMPv3 context) name.
The documentation should explain that in greater details.
Related
I am setting up greenplum 3 node cluster for POC while checking installation steps I found that hostfile_exkeys file have to be in master node.
Can anyone tell me where I should create this file location, node etc?
And most important what to put in this?
You create hostfile_exkeys on the Master. It isn't needed on the other hosts. You can put it in /home/gpadmin or anywhere that is convenient for you.
You put the three hostnames for your POC in this file. Example:
mdw
sdw1
sdw2
This is documented pretty well here: https://gpdb.docs.pivotal.io/5120/install_guide/prep_os_install_gpdb.html
You can also run a POC in the cloud. Greenplum is available in AWS, Azure, and GCP. It does all of the configuration for you. You can even use the BYOL product listings for 90 days for free to evaluate the product or you can use the Hourly billed products to get support while you evaluate the product.
There are examples in the utililty reference for gpssh-exkeys documentation but, in general, you should put in all the hostnames in your cluster. If there a multiple network-interfaces, those can go in instead.
I generally put this file either in /home/gpadmin or /home/gpadmin/gpconfigs (good place to keep all files for initial setup and initialization).
Your file will look something like (one name per line):
mdw
sdw1
sdw2
If there are 2 network interfaces, it might look something like:
mdw
mdw-1
mdw-2
sdw1
sdw1-1
sdw1-2
sdw2
sdw2-1
sdw2-2
Your /etc/hosts file (on all server) should include the IP addresses for all the interfaces and their names, so this file should match those names listed in /etc/hosts.
This is primarily to allow the master to exchange ssh keys with all hosts so it is always password-less login to the hosts. After you have this file set up, you will run (example):
gpssh-exkeys -f /home/gpadmin/gpconfigs/yourhostfilename
I hope this helps.
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").
I wrote a simple note taking program that's nothing more than a dictionary mapping a key to a value. IE
$ hlp -key age -value 25
$ hlp age
25
and it just stores information in a json file hardcoded to ~/.hlp.json. But I was wondering if there's likely some standard location I should be putting this file. Is there a standard location for databases like this?
A useful resource here is the hier(7) man page. (http://linux.die.net/man)
Data that is only going to be used by you belongs in $HOME, traditionally hosted under /home.
For something that is used to support the system itself, you'd be using /var. For applications that are just hosted on the system, you'd use /var/opt.
If the application is something big that could be replicated or moved to another system, you'd create a separate filesystem with a mount point outside any of those listed in hier(7). This could be a filesystem mounted from a SAN or NAS, which whould help mobility of the application.
Once you actually need to access the data from different machines, you'd have to move it to a network accessable key/value store or sql database.
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.
For an application I'm writing, i want to programatically find out what computer on the network a file came from. How can I best accomplish this?
Do I need to monitor network transactions or is this data stored somewhere in Windows?
When a file is copied to the local system Windows does not keep any record of where it was copied. So unless the application that created it saved such information in the file then it will be lost.
With file auditing file and directory operations can be tracked, but I don't think that will include the source path with file copies (just who created it and when).
Yes, it seems like you would either need to detect the file transfer based on interception of network traffic, or if you have the ability to alter the file in some way, use public key cryptography to sign files using a machine-specific key before they are transferred.
Create a service on either the destination computer, or on the file hosting computers which will add records to an Alternate Data Stream attached to each file, much the way that Windows handles ZoneInfo for files downloaded from the internet.
You can have a background process on machine A which "tags" each file as having been tagged by machine A on such-and-such a date and time. Then when machine B downloads the file, assuming we are using NTFS filesystems, it can see the tag from A. Or, if you can't have a process at the server, you can use NTFS streams on the "client" side via packet sniffing methods as others have described. The bonus here is that future file-copies will retain the data as long as it is between NTFS systems.
Alternative: create a requirement that all file transfers must be done through a Web portal (as opposed to network drag-and-drop). Built in logging. Or other type of file retrieval proxy. Do you have control over procedures such as this?