CentOS 5 :: Limit To The Number Of Virtual Guests?
Jun 22, 2010Does anyone know if there is a limit to the number of virtual guests you can have in kvm. RHEL has a limit of 4. RHEL AS is unlimited. What is CentOS?
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Server :: Limit On The Number Of Virtual Machines Running On RHES / CentOS XEN?
May 2, 2009We've been experiencing sudden host server crashes minutes after starting a fourth virtual machine. Our setup looks like:
Dell Poweredge T300
1 x Intel Xeon X3323 Quad Core 2.5 ghz
16 GB Ram
CentOS 5.3 (64 bit)
Server is running a stripped down version of CentOS 5.3 (64-bit), running only the built-in Xen Virtualization Environment. There is no other services running on the server (not samba, httpd, sendmail, cups... nothing except Xen) We've created several virtual machines, and as long as we don't start a fourth virtual machine everything runs smoothly (impresive hardware).
Each virtual server is configured as:
PARAVIRTUALIZED
1 Virtual CPU
1 GB RAM
However, 5 minutes or so after starting a fourth virtual machine, the entire host server crashes and restarts itself. Are we limited by the number of cores on the host machine CPU (4 cores)? 1 for the host and 3 for virtual machines? We've read in forums about other Xen setups running up to 11 virtual machines on less powerful hardware? (a dual core server). Should we be using FULLY VIRTUALIZED virtual machines instead? Is the number of XEN virtual machines in fact limited by the number of cores? If so, how can someone run several virtual machines on a single core host?
By the way, we were replacing a previous Dell Server (Poweredge 2600 with 512 MB Ram and a single Xeon single core processor running Open Virtuozzo). We were able to run up to 16 virtual machines at the same time. Of course none of the machines endured hard work (testing environments, etc). But hey, my point is that we expected to get a much higher number of virtual machines on this new hardware.
Security :: Limit Number Of Connections For Single Ip On Port 80 To CentOS 5.5
Sep 5, 2010How to number of connections for a single ip on port 80 to CentOS 5.5 with iptables? connlimit did not work on CentOS and nginx does not provide a module for that
View 4 Replies View RelatedUbuntu Servers :: KVM Guests And Host Connection - Run Two Virtual Machines
Jul 23, 2010We got a new server with 2 network interface cards with 4 MAC addresses in total. We would like to run two virtual machines (vserver1 and vserver2); one should connect via eth1, the other via eth2, and the host (mainserver) via eth0. The content of /etc/network/interfaces is as follows:
[Code]....
A connection from mainserver to vserver1 or vserver2 is not possible; a ssh connection from mainserver to vserverx ends with a login to mainserver.
Server :: Apache Virtual Host To Limit The Concurrent Connections Of Virtual Hosts?
Jul 3, 2009apache virtual host to limit the concurrent connections of virtual hosts? Taking into account the host of each virtual user's home directory can also have more than one subdirectory, which should be restricted to a subdirectory. Is beyond the control of the operation of these sites in a subdirectory. Best local restrictions or limitations to the overall situation.
View 1 Replies View RelatedSecurity :: Limit The Number Of Ssh Connections?
Dec 13, 2010Dist: Fedora 14
SSHD: OpenSSH 5.5p1
I need to limit the number of ssh connections a user has. All the users are using tunnel only so their shell is set to /sbin/nologin The logins do not open a shell they just create the tunnel so /etc/security/limits.conf has no effect on them at all.
I tried setting 'MaxSessions 1' in sshd_config but either that doesn't not do what I expect it to or it plain does not work as even with a normal user I was able to open an unlimited number of sessions. I need a good secure way to limit each user to 1 ssh session without them having a shell but Im unable to find a solution.
Fedora :: How To Limit The Number Of Files In A Particular Directory
Aug 31, 2011I was nosing around in my /home folder and I noticed that the /.thumbnails directory had 38,000+ files in it. That number seem a bit excessive to me. Is there a way to limit the number of files that are allowed to be in that directory, and maybe delete the oldest files automatically when the directory reaches it's limit in order to make room for the new incoming files, so there are no "directory full" type of errors?
View 8 Replies View RelatedUbuntu Servers :: Limit On The Number Of Processors?
May 6, 2010I have a server with 48 cores, 8 6-way Opteron CPU's. Ubuntu Server 9.04 only sees 32 processors. Is there a limit on the number of cores/processors that the server will use? Windows 2008 on the same server sees all 48 cores and the so does the BIOS, so this is unique to Ubuntu right now.
View 5 Replies View RelatedSecurity :: Limit Number Of Emails Send From One IP?
May 19, 2009I'm looking for a solution for sendmail to limit the number of emails send per miniute per IP. For example all my local computer user with ip 192.x.x.x need to able to send 10 emails/minite (emails, not connections!. The rest of the world can send for example 200 emails/minute to the mailserver. If the amount of emails per minute is exceeded, sendmail needs to block receiving emails from the spesific IP. I want to do this to stop spaming from my local network. Is it possible?
View 1 Replies View RelatedServer :: Limit The Number Of Logins For A User To Only One?
May 3, 2011I ran into a user today that indicated that their company only allows them to log in through a terminal session once (no multiple logins). On second try their login window terminates. They are using putty.Is this being accomplished through PAM or sshd ( or some other method)?
View 1 Replies View RelatedProgramming :: Limit In Number Of Fields That Awk Can Handle
Mar 2, 2011I have a file with 200 000 lines and I want to append the fields of each line based on matching first field. The resulting file should have 70 000 columns but has "only" 18 000. The command I'm using is working perfectly with a smaller file, wich lead to 14 000 columns. Could there be a limit in number of fields that awk can handle ? Here's my awk command :
Code:
awk -F, 'END { for (k in _) print _[k] } { _[$1] = $1 in _ ? _[$1] FS $4 : $1","$4 } ' file > out
Also, this command writes ^M (windows line break) after each columns. Removing them is easy but where do they come from ? Working on Ubuntu 10.10
Programming :: Limit Number Of Concurrent Jobs By Process Name?
Apr 7, 2011I am trying run audio conversion on my server that I want limited to a certain number of processes based on process name. I am using the following script but it isnt limiting the number of job like I want it to.
Code:
#!/bin/bash
$num_jobs = 13
while [ $(ps -A | grep -v grep | grep -c pacpl) -ge $num_jobs ]
do
sleep 1
[Code]...
Ubuntu Security :: Possible To Limit Number Of Prompts For Keyring Password?
Jan 18, 2010I have a standard home set-up for my Ubuntu OS, and I would like to know whether its possible to cut out the repetitive prompts to enter the password, as when you connect to the internet or access files on a partition that's not home, or install new software.
View 1 Replies View RelatedUbuntu Servers :: Limit The Number Of Concurrent Clients In Ssh Server?
Feb 1, 2011I am using ssh server to connect to my Ubuntu desktop. I opened the file sshd_config and change my port number of the server.I want to put a limit on the number of clients in the ssh server.
View 2 Replies View RelatedServer :: Limit Number Of Simultaneous Connections From Any Given IP Addrss Every 5mins Say
Jul 28, 2010except is there is a way to enhance mod_limitipconn.c to ensure that apart from restricting one connection allowed from a given IP, also set so that an IP can only connect on every set interval ?e.g.restrict the number of connections from a given source IP to say once every 5 minutes or so?if not mod_limitipconn.c, any other mechanism to do the expected result?
View 2 Replies View RelatedUbuntu Security :: One Limit The Number Of Open Sockets To Prevent Exploiting?
Dec 6, 2010I was searching around and I stumbled upon a Linux Kernelix Sockets Local Denial of Service exploit.I downloaded the exploit, compiled it ran it to check if I am vulnerable.As I was expecting, the exploit instantly "killed" my Maverick system and I had to use the power button to reset my computer...Is there any way to limit the numberof allowed open sockets?I don't think that this can be done using /etc/security/limits.conf in a similar way of preventing the fork bombs
View 1 Replies View RelatedGeneral :: Physical And Virtual Memory Upper Limit For 32 Bit?
Jun 26, 2010I have a 32 bit Ubuntu installed and my Laptop has 4GB RAM, but only 3GB is considered by Linux. My question is: what is the reason for the upper limit on physical memory ?
Code:
dmesg | grep Memory [0.000000] Memory: 3052428k/3112960k available (4673k kernel code, 56364k reserved, 2121k data, 656k init, 2200904k highmem) I am familiar with the virtual memory concept where linux splits upper 1GB for kernel and lower 3GB for user processes. In total, linux 32bit can address 4GB virtual addresses. Does this meant that 1GB of physical memory is already mapped to 1GB of kernel space and Linux only shows the remaining 3GB physical memory left for the user in the above command.
I did some searching on the internet and found some articles related to this, but it only confused me further since some articles suggest 4GB is the upper limit with mentioning whether it's virtual or physical memory, some bring in the concept of PAE, etc. I'm relative new to Linux's memory management, so it'd be really helpful if someone could answer this.
General :: Any Way To Limit X Number Of Samba Users By Samba?
Oct 12, 2009Is there any way to limit x number of samba users by samba ? Say if there are already 5 samba users using the share, I would like to restrict any futher samba requests.. How do i do that ?
View 1 Replies View RelatedDebian Configuration :: Maximum Number Of Virtual Network Interfaces?
Feb 11, 2010What is the maximum number of virtual network interfaces possible?I would like to create around 300 or so. This is needed to simulate a 300 node network.
View 6 Replies View RelatedServer :: Create A Virtual Host And Virtual Ip In Proftpd Centos?
Nov 22, 2010I want to create a virtual host and virtual ip in proftpd linux centos. can anyone please help me on this,I'm new in linux.
View 8 Replies View RelatedCentOS 5 :: Limit The Ram Usage Up To 4GB?
Aug 18, 2010I need to limit the ram usage under the below scenario,
" having 8GB of ram, need to limit the ram usage up to 4GB, thereafter must use swap only"
CentOS 5 :: File Limit Set To 2GB?
Dec 20, 2010I'm running CentOS 5.5 64bits. I tried today to create a 5GB test file as unprivileged user and the process limited the size at 2GB:
$ ulimit
unlimited
$ time dd if=/dev/zero of=test.bin bs=5000000000 count=1
0+1 records in
0+1 records out
[Code]...
CentOS 5 :: How To Check OS Back_log Limit
Jan 18, 2010I want to change back_log for mysql, but in documentation said OS has it's own limit. how can i check what that limit is?
View 1 Replies View RelatedCentOS 5 :: How To Limit Network Speed
May 3, 2011How to limit network speed? Is there any apps in Centos can do that?
View 1 Replies View RelatedCentOS 5 :: Limit To One Connection Per User For Ssh / Sftp?
Dec 3, 2009Is it possible to limit each user so that only one can connect via each username for ssh/sftp? I work with a small company where there aren't really enough of us to justify using a revision control system, but we don't want to accidentally step on each other's toes, so we'd like to try simply preventing more than one person from accessing a given domain at once.
View 15 Replies View RelatedSoftware :: Pam_limits(sudo:session): Wrong Limit Value 'unlimited' For Limit Type 'soft'
Dec 28, 2010my secure log is flooding with these messages..
sudo: pam_limits(sudo:session): wrong limit value 'unlimited' for limit type 'hard'
Dec 28 22:42:29 yn54 sudo: pam_limits(sudo:session): wrong limit value 'unlimited' for limit type 'soft'
Dec 28 22:42:29 yn54 sudo: pam_limits(sudo:session): wrong limit value 'unlimited' for limit type 'hard'
CentOS 5 Server :: Change Limit Of Max. Open Files?
Jul 17, 2009I use CentOS 5.3 and trying to change limit of max. open files.I added in /etc/security/limits.conf
root soft nofile 50000
root hard nofile 50000
CentOS 5 Server :: User Limit Access To One Folder
Mar 24, 2011for create an user I put:
useradd username
passwd username
CentOS 5 :: Control Groups To Limit The Memory Usage?
Aug 13, 2011I was looking into using control groups to limit the memory usage of each user on my CentOS system. I was told that this required me to recompile the kernel to have cgroup support. Is this true? Or is there a kernel module that will allow cgroups to work for users and groups on the system without kernel re-compile? Or, is there another way to limit the users memory usage? I have tried ulimit and it doesn't seem to work right.
I ask since this setup will be on a VPS system, that means to re-compile the kernel I need to use Xen instead of OpenVZ. Plus I have never in my life re-compiled the kernel, least of all with different modules ha ha ha so I would have to pay my NOC to do it. So if I don't HAVE to recompile the kernel to get cgroup support.
Server :: Limit The Suphp User Memory Limit?
May 12, 2010I have a VPS server with 512 MB memory. The php.ini is set so script memory limit = 16 MB. However, I have noticed in my top report, instances like the following:
Quote:
5484 coldclim 25 0 46476 32m 5920 R 0.0 6.4 0:00.93 php
The bold number of 6.4 is the % of sever memory this process is using. 6.4 % of 512 MB of memory is about 32 MB of memory, so it appears that this isn't being limited by php.ini. Am I correct? This leads to the next question: Is there some way to limit the amount of memory a single suphp process can use? (Basically, something like the setting in php.ini which limits suphp processes in the same way.)