OpenVZ/HyperVM Unable To Fork: Cannot Allocate Memory

Jun 5, 2009

We're in the process of setting up our new VPS Server, and we can create a VPS with 256MB memory and with 512MB memory fine, but when creating one with 1GB memory, we get the error:

Could Not Start Vps, Reason: Unable to fork: Cannot allocate memory: Not enough resources to start environment: Container start failed:

Even though the server has 4GB RAM and no other VPS's running. Any ideas?
Thanks.

[Edit]We now seem to get the problem for all our VPS's. I think it may be something to do with the Server not unallocating the memory, as we've provisioned and de-provisioned quite a few Servers

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Iconv: Unable To Allocate Buffer For Input: Cannot Allocate Memory

Jun 26, 2009

iconv: unable to allocate buffer for input: Cannot allocate memory

as title I have this error when I try convert database to uft-8
when I try this command

Code:
# iconv -c -f windows-1251 -t utf-8 vbulletin_db.sql > vbulletin_db_utf8.sql

I get this error
iconv: unable to allocate buffer for input: Cannot allocate memory

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Mar 29, 2008

Working on CentOs 5, I got this error when listing a folder 'ls' with 5 files in it:

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What does it mean? How can I fix it?

and my memory status is: .....

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Mar 21, 2007

I got this error after trying to login to the server

-bash: /bin/egrep: Cannot allocate memory
-bash: /bin/fgrep: Cannot allocate memory
-bash: /bin/grep: Cannot allocate memory
-bash: /bin/grep: Cannot allocate memory

Also I notice my server load are was also high due to '/usr/sbin/httpd -k start -DSSL' taking half of my CPU process. I tried to killall -9 httpd and restart again. See all below
login as: wheel
wheel@user:
-bash: /bin/egrep: Cannot allocate memory
-bash: /bin/fgrep: Cannot allocate memory
-bash: /bin/grep: Cannot allocate memory
-bash: /bin/grep: Cannot allocate memory
[~]# su -
Password:
-bash: /bin/egrep: Cannot allocate memory
-bash: /bin/egrep: Cannot allocate memory
-bash: /bin/egrep: Cannot allocate memory
-bash: /bin/egrep: Cannot allocate memory
-bash: /bin/fgrep: Cannot allocate memory
-bash: /bin/grep: Cannot allocate memory
-bash: /bin/grep: Cannot allocate memory
-bash: /bin/cut: Cannot allocate memory
-bash: /bin/cut: Cannot allocate memory

After then I reliased I cannot pingt the server from same Lan network

root@t [~]# ping xxx.xxx.xxx.xxx
PING xxx.xxx.xxx.xxx (xxx.xxx.xxx.xxx) 56(84) bytes of data.
From xxx.xxx.xxx.xxx icmp_seq=1 Destination Host Unreachable
From xxx.xxx.xxx.xxx icmp_seq=2 Destination Host Unreachable
From xxx.xxx.xxx.xxx icmp_seq=3 Destination Host Unreachable
From xxx.xxx.xxx.xxx icmp_seq=5 Destination Host Unreachable

My server was totally offline!

When I type 'ls', it says
bash /bin/ls: Cannot allocate memory.

I have unplugged the server from datacenter. Right now the server is infront of me. Please advise what command and fixes should i do.

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PleskLog File

104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server
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and Apache Log

[Mon Jun 22 11:06:57 2015] [error] server reached MaxClients setting, consider raising the MaxClients setting
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PHP Warning: Module 'zip' already loaded in Unknown on line 0

How can I fix this problem? The Script is 100% i/O because it has worked onder PHP 5.2 and its comp. whit 5.4.

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Apr 25, 2009

I am trying to create some vps using openvz but after creating the vps with the Centos basic template 304mb i can't ping the ip and i can't view the centos welcome page in my browser (using ip and not domain, so i don't need to change there anything yet) and the most important is that i can't connect to the vps using ssh

I aks for many good users about my problem but i don' found a solution yet.

I ask my DC about ip's and they told me that the ip's are routed in my server.

I follow this instructions:

Filesystem Size Used Avail Use% Mounted on
/dev/sda1 50G 2.8G 44G 6% /
/dev/sda3 198M 21M 168M 11% /boot
/dev/sda5 408G 2.4G 385G 1% /vz
tmpfs 1012M 0 1012M 0% /dev/shm

I follow this:

I disable selinux by editing /etc/sysconfig/selinux and changing the line to selinux=disabled
and then run:

I just login using ssh as root and run the folllowing commands.
Did i have to move to another directory to run them or ?

setenforce 0
wget[url]

Next i open /etc/grub.conf
vi /etc/grub.conf
and change default=1 to default=0

Then i add the ip's at the pool and create a plan and then create a vps without any errors but nothing.

I try with my DC resolvers or the 4.2.2.1 4.2.2.2 but nothing.

I alo add at the settings the gateway with no results at all.

After all i can't ping the ip that the vps got from the pool even ping it and not possible to connect to it using the ssh Sad

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Apr 17, 2009

When you're creating VPS container, you can ssh with that IP and login with your username and password correct? But, what is the problem when I successfully created a VPS, and when trying ssh into it, I can't. Ok, here we go. I want to create a 2nd vps and will be using it as my DNS server. I enter a set of IPs into HyperVM's IPpool. First IP: x.x.x.178 Last IP: x.x.x.182 Resolv Entries (space Separated) : Gateway (IP): x.x.x.x.177 NetMask: 255.255.255.248

Then I created a vps resource plan. And then I created a VPS and it use the first IP from above. I want to connect to SSH and want to make it as my DNS server but seems the IP are not responding, it wasn't even live. So, what is the problem here? Where I did wrong? Just to let you know, I successfully created 1 VPS before that and it works without any hiccups. Got even whm/cpanel installed as well on it. The thing that I suspected is that my DC pulled the IPs off me and assigned them to other server. Waiting for their reply on this though.

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This is something we are very interested in doing and we feel it would be a big jump from the very low-end budget HyperVM/OpenVZ Approach.

Your Views on the Virtuozzo Vs HvM/OvZ would be very helpfull.

Would you rather buy a low priced Virtozzo VPS or an even lower priced HyperVM powered VPS? Im quite lost as to wether the financial investment would be worth it, I don't see how it wouldnt be as HyperVM is very buggy and really doesnt give a full sense of security in my personal opinion.

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Quote:

Alert: The vpsid 470 : localhost exists on another server.

Please confirm exactly how to change the VPS ID for an OpenVZ VM as I've gone through all the LxLabs posts dealing with this subject and none of the proposed solutions work correctly.

Neither of these HyperVM commands work:

Quote:

/script/shift-vpsid
/script/shift-vpsid slave-id 1000

This method doesn't work:

Quote:

vzctl stop 470
mv /vz/private/470 /vz/private/430
mv /vz/root/470 /vz/root/430
mv /etc/vz/conf/470.conf /etc/vz/conf/430.conf
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Power Panel: HyperVM
RAM: 256MB+ / 512MB+
HDD: 10GB+
BW: 150GB+
IPS: 2+
CP: Yes (DA, cPanel)
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Starting Container ...
Can't mount: /vz/template:/vz/private/1110 /vz/root/1110: No such file or directory
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If there isn't, I think I'll have to move all data across the orthodox way - which I clearly want to avoid.

PS: OVZ is on a different node from the VZ (duh!) but also will be utilizing different IP ranges. So, I think I need advice on changing IPs of the VEs too.

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I was told by my VPS host that OpenVZ / HyperVM is to blame. The overwhelming issue is: if I pay for 256mb of ram and I'm being cut short, then I'm obviously over paying. What's more: how can I tell whether or not I'm being cut short?

Has anyone run across these problems in the last two weeks?

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I work in Unix dept. I suggested to Windows admin I use ASSP personally and works great. I gave them the specs on my setups. Since the current front-end proxy is on RHEL, we all settled to try out ASSP on Ubuntu based server.

We scrap-find an older Dell PE 2850 we can use. I finally convinced company to deploy OpenVZ, this will be our first OpenVZ server public facing.

The Dell have two Intel 82541GI Gigabit NICs. We are VLAN-ing on Cisco switch level; eth0 will be on internal 10.0 network and eth1 on public port.

I already installed CentOS 5.2 plus HyperVM. I configured and brought up eth1 without TCP/IP, just on layer 2. Looks like OpenVZ is using eth0 right now.

For this new proxy, will be routing traffics through host eth1. What's the best way of going with this? The new proxy will be using veth so it will have its own MAC (for security reasons; and network team said this is mandatory).

Should I be using bridging? Or simple routing guests through VZ configured eth1 would work?
Can anyone give me some ideas? I'm asking in WHT is because a lot of hosting companies probably have this setup already. I'm just absorbing ideas...

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Mar 10, 2009

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The images tagged modernadmin all include preconfigured DenyHosts to prevent SSH brute forcing of your customers VPS.

Available are the following for OpenVZ:
centos-5.2-i386-hostinabox-modernadmin.tar.gz530,147.2KB
centos-5.2-i386-modernadmin.tar.gz109,654.2KB
centos-5.2-x86_64-modernadmin.tar.gz134,665.8KB
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debian-4.0-x86_64-modernadmin.tar.gz143,096.5KB
debian-5.0-i386-modernadmin.tar.gz75,740.6KB
debian-5.0-x86_64-modernadmin.tar.gz159,226.4KB
fedora-core-10-i386-modernadmin.tar.gz165,429.6KB
fedora-core-10-x86_64-modernadmin.tar.gz174,693.8KB
ubuntu-7.10-i386-modernadmin.tar.gz76,415.5KB
ubuntu-7.10-x86_64-modernadmin.tar.gz76,133.2KB
ubuntu-8.04-i386-modernadmin.tar.gz70,725.7KB ...

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Any screenshots...?

Watch out HyperVM and VZPP....

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Dec 25, 2008

today i get a vps from lime, and i try to create a vps

but when i try to enable vps i get this message :

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and the disk usage not display properly:

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Oct 31, 2009

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Additional how I can see how much bustable memory I have used or how much total memory my VPS is using.

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Apr 16, 2009

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I also have two other VPSs, one Xen and one Virtuozzo and have no troubles with Apache.

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Dec 1, 2007

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But, how much memory does your VPS really think it has available? and what happens if the other VPS (or the system) decides it wants it memory back?

Does OpenVZ just start killing off your processes until it free's up enough memory?

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Oct 30, 2008

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512MB
1024MB
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How to set this to the VE?

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Apr 18, 2009

Few months ago I bought new small VPS box (OpenVZ, 128 MB RAM) in order to place there a new monitoring node of my site monitoring system. Such small amount of RAM is a challenge for operating system optimisation techniques (OpenVZ doesn’t have “swap” as Xen does).

First of all I discovered that apache2-mpm-worker (Apache implementation that uses threads) consumes more memory (100MB) than the classic version that use separate processes (20MB). I had to switch to apache2-mpm-prefork version then.

Next unpleasant suprise: small Python app eats 100MB of virtual memory! I checked that virtual (not resident) memory is taken into account by VPS. I applied some tools to locate memory bottleneck, but without success. Next I added logs with current memory usage to track call that causes big memory consumption. I tracked the following line:

server = WSGIServer(app)

is guilty for high memory increase. After few minutes of googling I located problem: default stack size for a thread. Details:This line creates few threads to handle concurrent calls

Stack size is counted towards virtual memory

Default stack size is very high on Linux (8MB)

Every thread uses separate stack
=> multi threaded application will use at least number_of_threads * 8MB virtual memory!

First solution: use limits.conf file. I altered /etc/security/limits.conf file and changed default stack size. But I couldn’t make this change to alter Python scripts called from Apache (any suggestions why?).

Second (working) solution: lower default stack size using ulimit. For processes launched from Apache I altered /etc/init.d/apache2 script and added:

ulimit -s 256

Now every thread (in apache / Python application) will use only 128 kB of virtual memory (I lowered VSZ from 70 MB to 17 MB this way). Now I have additional space to enlarge MySQL buffers to make DB operations faster.

There’s even better place to inject ulimit system-wide: you can insert this call in:

/etc/init.d/rc

script. Then ulimit will be applied to all daemons (as Apache) and all login sessions. I reduced virtual memory usage by 50% this way.

Note: you may increase stack size on stack overflow errors. In my opinion 256 kb is safe option for most systems, you may increase if in doubt. Still memory savings are big.

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Dec 9, 2007

What is forking, it's taking a bite out of apache processes:

[url]
[url]

Load was at 8 just before the fork:
[url]

But it's a quad core and wasn't swapping

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Feb 7, 2007

I'm getting errors when I try to run perl scripts from my SSH command line. Following is the console output. (Please note that I could run this script with no problem last night.)


Code:
gcoates@server [~/public_html/gimage-test/cgi-bin]# ./post_invoices 2004
sh: fork: Resource temporarily unavailable
sh: fork: Resource temporarily unavailable
ERROR: Date::Manip unable to determine TimeZone.
at /usr/lib/perl5/site_perl/5.8.5/Date/Manip.pm line 3635
Date::Manip::Date_TimeZone called at /usr/lib/perl5/site_perl/5.8.5/Date/Manip.pm line 676
Date::Manip::Date_Init() called at /usr/lib/perl5/site_perl/5.8.5/Date/Manip.pm line 799
Date::Manip::ParseDateString('now') called at /usr/lib/perl5/site_perl/5.8.5/Date/Manip.pm line 1791
Date::Manip::UnixDate('now', '%Y-%m-%d %H:%M:%S') called at gImage/Util.pm line 13
gImage::Util::get_current_time() called at gImage/Invoice.pm line 413
gImage::Invoice::post_invoice('gImage::Invoice=HASH(0x9ae0e1c)', 1) called at ./post_invoices line 24
Issuing rollback() for database handle being DESTROY'd without explicit disconnect().

For obvious reasons I do not wish to disable shell fork bomb protection. This is a shared server after all.

I stopped, restart sshd but that did not help.

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