Ubuntu Servers :: Possible To Disable Nf_conntrack ?
Mar 21, 2011
I have a server running 8.04LTS with haproxy. This is a loadbalancer that handle port 80 connections.
However, I am seeing a lot of conntrack problems.
The default value is 65536 already. I have googled around and some says 65536 is the max value to go but some says to double the value to 131052 and so on. I did try increasing the value but the error still come.
Some says this is due to synflood and so on. I don't think it's synflood as we do connections more than 65536 with this haproxy.
Some also said to disable nf_conntrack. I have searched but there are no guide on how to disable nf_conntrack in ubuntu 8.04. Anyone can help to shed some light into this problem?
Should I increase the value to some crazy high one like 252000 (does it work?) or disable nf_conntrack?
If I disable nf_conntrack, will firewall software like CSF still work?
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Apr 6, 2011
I tried installing nf_conntrack module in RHEL , it fails
[root@boot]# modprobe nf_conntrack_ipv6
FATAL: Module nf_conntrack_ipv6 not found.
[root@boot]# modprobe nf_conntrack
FATAL: Module nf_conntrack not found.
[root@boot]# lsmod | grep -i nf
nfnetlink_queue 16129 2
nfnetlink 10713 4 nfnetlink_queue,ip_conntrack
[Code]....
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Jan 24, 2010
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Code:
apt-get remove plymouth
Reading package lists... Done
[code]....
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Jan 2, 2010
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Apr 29, 2011
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Apr 1, 2011
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Apr 28, 2010
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[code]...
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Feb 5, 2011
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Jan 24, 2011
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May 10, 2010
i found this video, and i really want to do the same. *newbie needs to learn [URL]...my question is, what need to be installed and how?
is there any specific configuration to make it works?
and will it work if i want to connect from Ubuntu to Fedora ?
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Apr 1, 2011
I'm curious if anybody can shed some light for me in this department. We're in a large environment with a Windows DHCP Server. We have been tinkering with LTSP on Edubuntu as thin and fat clients. It works great, but right now we just have 1 server handling the lab, which works fine unless we want to expand, which may be very possible.
These are the instructions I received:
Login to your windows server and load the DHCP configuration screen
Create a DHCP reservation for the MAC address you obtained
Add the configuration options below to enable the machine to boot from the LTSP server
017 Root Path: /opt/ltsp/i386
066 Boot Server Host Name: <ip address>
067 Bootfile Name: ltsp/arch/pxelinux.0 # Specify CPU architecture in place of 'arch', for instance 'i386'
From: [url]
I'm curious, what if I want to have multiple Ubuntu servers on the network that I want to have bootable? For example, let's say I have 3 labs, and 3 servers. Server A to Lab A, Server B to Lab B, and Server C to Lab C. I want all C's computers to boot to C, and B to B, A to A, etc.
1 - How would I add multiple entries on the Windows DHCP Server to allow all 3 (A B C) servers to boot?
2 - How would I be able to isolate the clients so ONLY Lab A clients boot to Server A, etc?
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Mar 4, 2010
(Mods: If you feel this belongs more in the Games or Wine discussion area, please feel free to move. This question does intersect many areas, so was unsure where to put)
I have a funky server Ubuntu 9.10 Enterprise setup where I have X on all the time (using Xfce4 - not Xbuntu) with latest wine so I can run Windows only based game server executables. One of the applications is a simple dedicated racing game server made by the company I work for that works perfect in wine (unfortunately, the full 3D game client does not, so its a windows only game). The other is more just to test, runs Serious Sam HD dedicated with wine with a steam client active in background since SSHD Ded requires a steam client logged in (just create a dummy account).
Im getting some lag issues with the SSHD on the end-users client side. Unsure if its related to it being a more complex game and using wine to translate slowing it down. Things like tiny warps once in awhile, and the ping of clients kinda jumping around.
Im pretty sure my network settings are ok. Maybe not fully optimized for every bit via ipv4. Still though. This 1U Opteron server is in a ISP with a full 1000 up and down. Ports are locked out that aren't being used. I do have apache going, but its nothing strenuous. The CPU isnt used overly so. Maybe peaks out around 60% under strain, but mostly 20-40%. Memory use is about 550-700megs for SSHD itself. Given, it only has 2 gigs total at this time, but I still usually have near a Gig of memory available at most times.
I admit newbness of linux servers in general. Was reading about other game servers like CS:S requiring a ticked kernel near 1000 to get the least amount of lag. Some even saying they dropped the tickless options of the newer 2.6 kernels on purpose because they produced lag. Was checking on the history of newer Windows Server like 2008 and they still use a ticked OS, though a more optimized version.
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Sep 5, 2010
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Any other web server request should go to the apache.
I tried adding the following to /etc/ufw/before.rules
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Oct 30, 2010
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