CentOS 5 Networking :: UCD-SNMP-MIB Doesn't Seem To Work
Aug 20, 2009
I am trying to monitor a Centos 5.3 box using SNMP and I am having a lot of trouble getting the data that i need from it. Everytime I try to get information from the UCD-SNMP MIB it returns "End of MIB". It is my understanding that UCD-SNMP is a standard package when Net-SNMP is installed and should always be there. Then why can't I access it? I have tried removing the reinstalling Net-SNMP, but that hasn't worked. My server is update date on all it's patches as well. It is quite old hardware, but I don't believe that should affect SNMP from being gathered. Iptables is down, and I cant' even get it from the local machine.
I have a small problem with lmsensors and snmp since I upgraded my small server from 9.10 to 10.04. I use cacti to monitor my servers usage, disk space as well as temps and fans. This was running very fine before the upgrade, but now I don't get data anymore from lmsensors. It seems that SNMP doesn't give this information as before. (Cacti log says: "No sensor data was returned from SNMP")
sensors give the following output:
Code:
w83627dhg-isa-0290 Adapter: ISA adapter Vcore: +1.12 V (min = +0.00 V, max = +1.74 V) AVCC: +3.41 V (min = +2.98 V, max = +3.63 V)
This will be a little long (having read Phil's 'how to ask questions' FAQ). I'm trying to get OpenVPN working between my CentOS server and some Windoze laptops running XP. There seems to be plenty of sample config files available, but to date, none of them have worked for me. Pulling out my trusty Wireshark, I've found some clues,
BACKGROUND: My local subnet (NAT'ed by my gateway router) is 192.168.52.x. My router has been configured with a conduit (port-forward) for port 1194 (the standard OpenVPN port), which points towards my CentOS server.The CentOS server is .52.112, and the supplicant is .52.110. I have tried the lient both inside and outside my local subnet, with no difference in events or outcomes.
We have a Blade server connected to a two internal ESM Cisco switch. We want to have a active-backup configuration with bonding. We follow the documentation and we hace configured the next:
I'll start by saying that most of this is built inside of a 64bit ESXi 4.1.0 server. Should be obvious by the picture below.
Trying to set up a bridged CentOS box. Ultimate goal is to set up a Transparent Firewall. The machine labeled 'Desktop' is a Windows XP running DHCP. It gets assigned an Internet routeble IP address. At this point, nothing is running a firewall.
Symptoms: Gateway can ping CentOS bridge CentOS bridge can ping gateway CentOS bridge can resolve DNS names and ping FQDNs on the Internet. CentOS bridge CAN NOT ping Desktop
Wireless networking doesn't seem to work. When I try to create a new network interface with system-config-network, my wireless card doesn't show up. The following comes from dmesg:
I saw a post about this elsewhere and downloaded some firmware drives from [URL] and installed then. But, I'm really out of my league when it comes to this kind of stuff.
I just installed the snmp packages on Centos 5.2, and when i tried to use the snmpwalk command, the data is not showing and i got this error: No more variables left in this MIB View (It is past the end of the MIB tree).
I have this annoying problem since day one.I am testing out Red Hat RHEL5, everything is fine except DNS look up.If I ping www.google.com, it doesn't work, ping ip address it all works;if I bring up browser, put www.google.com it doesn't work, can't find the name, however, simply put ip address there it works.My DNS seeting seems ok, and the DNS works from Windows box.
I have a favor to ask, I've been having a really hard time trying to understand how snmp traps work, what can they do for you, and why they are useful. I've done some research and I've even set up snmp clients on linux systems, not necessarily the traps. I know they communicate on port 161 and 162 and I also know that you set them up to connect to a community string. Still I cant grasp the concept. If you don't mind can any one break it down for me, in very basic terms.
Update was successful (I didn't see any errors). Then I rebooted pc and found out that my web is extreamly slow. In httpd logs I found: php -> file_get_contents [URL] always dies (timeout error, but somedomain.com is fine, I can telnet it easy on 80) I was wounder if it's update problem and tried yum:
>yum update Loaded plugins: fastestmirror Determining fastest mirrors Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=5&arch=i386&repo=os error was [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')> Error: Cannot find a valid baseurl for repo: base
so you doesn't work too... I have no proxies, I tried to reboot pc, I tried: yum clean all
1) Installed Cent os 5.4 in my system (name it as "guest os").
2) Downloaded the full kernel source, and patched the vanilla kernel to export symbol table (2 line change) [URL] (Yes I know that kernel should not be touched, if touched you should not seek help here . but I felt I didnt do any big change in kernel there). Besides we unset the config_smp & config_preempt parameter to make the kernel as not SMP and not preemptive .
3) Then compiled and booted with the new kernel 2.6.18, everything went fine . Now my gust os box is loading fine and I dont have any issue .
So now I need to install this above machine as guest OS in one more XEN machine cent os 5.4 (name it as "xen os").
So we created the image out of the above box "guest os" and added it as VM in xen os . But while booting it always hangs under some error like "/usb device sort of thing" (I dont have the screen where it hangs, but I do have the equivalent xen log from XEN OS linked to [URL] .
1) what the error is, and what need to be changed in my guest os build .
2) In general I am new to this VM and XEN installation, to be frank I am completely zero . Does changing the native os 5.4 to guest os need any change in kernel or something.
3) Does this case possible, install plain cent os in xen machine. After then patch the kernel in VM and boot with that . I guess it should not be possible ...
4) If possible guide me to some documentation where I can learn few basics over this.
I have a dedicated server running CentOS 5, Plesk 9.2.2, SMTP Postfix and Courier-IMAP.The issue I have is that on all domains on the server receiving email works fine however sending email never seems to work. This is from email programs, my phone, webmail and PHP. None of them seem to be able to send email. If it is of worth Spam Assassin is running however I don't feel it is causing any problems.
I desperately need help with Bering UClibC and SNMP checks. Now before I begin, I have managed to get this working on CentOS in the same hosting environment, so I am not completely new to this.Now my problem.I am trying to get OpManager checks (live moitoring software) to work on Bering 3.1.1 over SNMP.I have configured everything correctly in the snmpd.conf. The correct natting and ports are open from the firewall, I have installed all the packages necessary (netsnmpd.lrp, libm.lrp, libsnmp.lrp, snmpmibs.lrp).
I have been working on this for the last 3 days and it is starting to get very frustrating that I cannot get this to work. The main device that I am trying to get working is a Soekris 5501, thinking that it might be a hardware issue I booted up a workstation and ran Bering and tried it on there and still no luck, which basically ruled out hardware. I believe it's a MIBs issue, but I cannot seem to find the MIB's required for the Soekris device.
Can anyone shed some light on this issue? Or can someone confirm that they have gotten SNMP checks to work with Bering on Opmamager and if so how did you do it?
I'm quite new to Linux and totally new to CentOS. I need it to isntall a Lotus Domino Server, and for security reason i'd like to install the Acronis Linux agent to backup this server with my Win Acronis enterprise server. I have installed a new CentOS server 5.4 on a Vmware virtual machine, then installed the Acronis Linux agent following the instruction here [URL].. The agent seems to work because with the command "/etc/init.d/acronis_agent status" the sistem respond with "Acronis Agenti is running"
But i can't connect to the agent from the server console!
I have disabled the firewall to avoid any connectin problem...
Is there a reason why the selinux module for nagios just doesn't work? I'm running CentOS release 5.4 (Final) and did "yum install nagios" and now have nagios-3.2.0-1.el5.rf installed. I'm having to create policy after policy after policy, and still haven't reached the end of the rainbow.
I suppose after I run out of selinux violations, I could figure out how to combine all of these modules and post the result, but it seems really, really weird to think that I'm the only person who has ever installed nagios from the repo with SELinux enabled.
system-config-samba doean't work from terminal neither it is shown in graphical mode, i cannot see system > administration > servers. Server is missing.
I'm a visual effects artist and although many VFX post production houses use linux, I've always used windows because of the programs. At this point, I've migrated to different programs which are also available on linux. The only set of programs I won't have, would be the Adobe Suite. So, I decided to finally start using linux again. I used it back when I was a kid for a few years, but just to have it really. We mainly use macs at work, but I'm switching to linux now.
Since I mainly use Autodesk Maya, the first choice would've been RHEL. Which is why I'm here now, you can guess.
I've downloaded the .iso of CentOS 5.5 and checked it against the hashes and it came out fine. I burned it to a DVD and booted my main computer (I have 3 I plan on installing it onto) and tested the media, came back fine.
I have two HDs, one 1.5TB SATA and one 150GB SATA. The 1.5TB is the C: drive of windows, and I've shrunk it to allow 80GB for linux.
So that is sda. sda1 is the windows partition and I make sda2 ext3 out of the empty space by choosing the custom partition scheme. It installs fine.
However, booting up the computer boots straight to windows. No GRUB.
I've reinstalled many times now, changing the GRUB from sda to sda1 to sda2. Nothing.
[url]
I've adapted that guide to CentOS and tried that, but whenever I select the CentOS option during bootup, the computer instantly restarts itself.
I've tried reinstalling the GRUB via a Live CD like many googled sites say to, but I always get errors.
If I find the /boot/grub/stage1, it says it can't be found.
If I try to setup GRUB, it says /boot/grub/stage1 is unreadable
So, I download the Ubuntu CD and install that. I use the guide previously posted to do the same thing, by installing GRUB onto sda2 where Ubuntu is.
So I pick that option on startup and it brings me to Ubuntu's GRUB menu. It all works fine. CentOS doesn't though.
Ubuntu is using GRUB2, so it has a grub.cfg file. Inside the file near the end, it lists Ubuntu as (hd0,2) and windows as (hd0,1).
That shouldn't be right? What's (hd0,0) then?
The CentOS grub.conf file lists CentOS as (hd0,1) and windows as (hd0,0). That should be correct. But I change it anyway to (hd0,2) and (hd0,1) and it still doesn't work.
We are running CentOS 5.3 on a Logic Supply PT109, a ruggedized PC. For some reason the serial ports don't work when the IRQ is configured (i.e. setting IRQ to 0 makes it work, but performance suffers with the polling).
I've used minicom, picocom, and plain old cat and echo talk to the port both with a loopback connector and to another PC. statserial shows the control lines changing as I change the various settings and connect the loopback connector. I am confident that the hardware is fine as DOS diagnostics show the COMx ports working with various baud rates. I have tried changing the IRQ from the default of 11 to 3 and 4, turning flow control on/off, and tried another PT109.
strace shows data being written, but none being received, so my theories are either the interrupts aren't being generated (doubtful since the ports tested okay with DOS) or the serial driver isn't handling the interrupt. The serial handler shows up in /proc/interrupts when the port is opened. The interrupt counts do go up slowly, but not in response to activity that I can correlate:
In a nutshell, my situation is that I need snmpgetnext. My understanding is that this should be installed with net-snmp (net-snmp.x86_64 specifically); this is not occuring. I cannot use it as a command, and I have tried quite a few searches (whereis, find / -iname "snmpgetnext", "snmpget*" | grep next, "*next*" | grep snmp, and a host of similar oddities). Can I find snmpgetnext in a yum repository, preferably an official one?
More specifically, I'm using a software package that requires CentOS with kernel 2.6.18-53.somethingorother. This is a separate issue that has been brought up with the vendor. Generally this just means I install CentOS 5.1 and don't do a full upgrade. we are monitoring with Nagios. The Nagios check_snmp plugin won't compile without a valid path to snmpgetnext, which I can't get to install. This is severly hampering my ability to monitor the server.
I have installed ubuntu and Centos 5 , but when i do sudo update-grub , the new centos 5 is not detected. Some days ago i did the same (i installed ubuntu , and then Centos 5) , but i had to format the hard disk because some problems i had. The thing is that in that first time update-grub worked , but now not , why? Shouldn't be detected this time too? I have to manually add the new entry to the grub no?
Trying to migrate our news server to a new instance on centos5 and having issues with the makehistory utility. It errors out and then just creates all null values for the overview database. Here is the output:
My problem is that I cant "rewrite" older password to new. It looks like I do:
Changing password for user johny. New UNIX password: Retype new UNIX password: passwd: all authentication tokens updated successfully.
all looks OK but after set up new password I can log in using OLD and NEW password. It's very unsecure for me. So in fact I cant change password and it looks like centos create next password to one accout and one account have more then one password... how can I prevent it? pls help me couse its very unsecure in my case.user looks in file shadow /etc/shadow like this:
I have 2 Centos 5.2 install that cant be snmp queried from another machine and I am unsure of what to check next.
To make sure it was not an incorrect iptables rule i temporarily turned off iptabes with the same results. I have checked the hosts file and it is correct on both machines.
