CentOS 5 :: "Mount-cache Hash Table Entries" Problem
Mar 1, 2009
I have Celeron 2800D, 512 RAM (2 slots 256 each). I'm trying to install CentOS 5.2, it asks me about installation type (I tried graphic and text already, it stuck anyway), then after I press enter it shows me "Mount-cache hash table entries: 512" and that's all. I waited severl mins, it doesn't move. I tried to reboot pc several times, it's same. Then I removed 256 and left only 1 slot. and it's fine! I installed centos successfuly. Then I inserted second memory and centos does't load. I see some colored (each time new color) text that changes very fast and then black screen. I connected other HDD with WinXP, it runs fine, it shows me 512 mb, I can lunch Visual studio 2005 fine, etc. But centos just stuck each time if I have memory in both slots.
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Jul 28, 2010
I got a new ipod touch the other day and have been unable to get anything to read it properly. it automounts just fine and i can browse the file system. Normally with my old ipod i just used gtkpod and it worked fine. With gtkpod you have to tell it where the ipod is mounted. The problem is that i cannot see where the ipod touch is mounted It is connected right now and i can see it in nautilus and i can browse the file system, however...
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Partition table entries are not in disk order. what the?
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May 25, 2011
I'm getting millions of log entries in my nscd.log like the ones below. There's no connection to (or from) this IP address so I'm totally at a loss for what would cause this.
Wed 25 May 2011 06:56:49 PM GMT - 5557: Reloading "65.83.237.34" in hosts cache!
Wed 25 May 2011 06:56:49 PM GMT - 5557: Reloading "65.83.237.34" in hosts cache!
Wed 25 May 2011 06:56:49 PM GMT - 5557: Reloading "65.83.237.34" in hosts cache!
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Sep 6, 2009
I have encountered something of a mystery here. The other day while in /dev I ran 'ls sda*' and noticed this...Quote:
ls -lZ /dev/sda*
brw-rw----. root disk system_u:object_r:fixed_disk_device_t:s0 /dev/sda
brw-rw----. root disk system_u:object_r:fixed_disk_device_t:s0 /dev/sda1
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Nov 10, 2010
I have a very bad attempt at hashing the components of an tcp session to assign/locate the session in a hash table bucket. I am pretty sure that it has a very high collision rate and when there are a very large number of tcp sessions my application is having to search a long linked list to find the session within the bucket.
All the hashing functions I have found take a single string input where I need to input several integers and hash them into a single result. My guess is that any real hashing function is going to produce better results than what I am currently doing.
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May 19, 2011
Anyone, I would like to ask if it was possible to change the entries of a file's inode table ?
For example
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I was wondering if I can change the entries in this inode table's entries.
For example I want to change the "Modify" entry ? I want it to reflect to day 2009-05-19 for example.
Can i do it ?
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Jan 20, 2011
I have a Slackware 13.0 server that is not replying to icmp pings. However, I have double checked that /proc/sys/net/ipv4/icmp_echo_ignore_all is set to 0. The weird thing is I can run nc -v slackware 22 from any computer on my lan and the banner comes up just fine. The nic is on the same netmask and broadcast as all the other computers on my lan. I can log into it as well, it just doesn't respond to pings. I can even ping other computers and get replies just fine when pinging from inside the Slackware server.
I have even added an iptables INPUT rule for -p icmp -j ACCEPT. Although I've never had to do this. I ran tcpdump -vv icmp and I can see ping requests coming into the computer, however slackware simply doesn't respond. What could be causing this? A corrupt arp cache? It's been happening for more than a few hours so I wouldn't think so. How can I view the arp cache table? How do I clear it?
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Aug 19, 2011
We purchased a virtual server from GoDaddy (1 month trial) to set up as a proxy for our networks (24 of them). I am having 2 separate issues. The first is I can't configure/install NAT and support is telling me the only way I can is to purchase a dedicated server. Here's the error:
iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 3128 iptables v1.3.5: can't initialize iptables table `nat': Table does not exist (do you need to insmod?) Perhaps iptables or your kernel needs to be upgraded. Here's the fix: [URL] So, what I am hoping to do is configure this by just opening port 3128 directly, and only allowing access from our networks. As a test I did this and allowed only from our office and it did not work. However I can't connect, so I am wondering what I am doing wrong? Here's my squid configuration:
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Jun 13, 2010
I just downloaded CentOS-5.5-i386-bin-DVD.iso from a mirror and there is no check sum file or hash for
this ISO. The md5sum.txt file contains:
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Mar 11, 2010
I have some problems with CentOS 5.4 and standard kernel 2.6.32.7, which I need for realtime extensions.With the solution in this thread: [URL] I could boot the new standard kernel , There are still two error messages during the boot process:
"insmod: error inserting /lib/dm-region-hash.ko -1 fikle exists"
and a problem with ip-tables "could not restore ip-tables line 20" or so
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Aug 1, 2010
been searching google and forums for about 5 hours now, and can't figure this one out, I have a server running opensuse 11.2 sharing various NFS directories, I have one laptop that is running 11.2 and I have no problem getting my NFS shares from the server.On my other laptop that is running 11.3, I had the shares working at one point, but changed things around and added a new HD to the server, now I can NOT get this thing to work, I have tried everything I could find to read on it. Started and stopped the NFS server and exportfs -a, and checked /var/logs/messages on server and nothing about this laptop (192.168.0.102 suse 11.3) trying to connect.On this laptop, I have deleted all the shares, and tried to re-add them but still get this error everytime.on server /etc/export:
/home/kryptic/ *(rw,no_subtree_check,sync)
/backup/Media/ *(rw,no_subtree_check,sync)
/backup/Dales_Backup/ *(fsid=0,crossmnt,ro,root_squash,sync,no_subtree_check)
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Jan 17, 2010
I am getting this error when trying to mount my client on the directory I exported in Yast2 NFS Server
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Jun 18, 2011
I had the idea to cache writes to my nfs filesystem on my local hard drive.
It seems CacheFS exists to cache reads, but not writes to nfs.
I would imagine that if I could cache writes to my nfs on a local drive I could have a fast system, but keep all my files where I want them on my network.
I'm thinking about this because I am planning on buying a SSD, and I would imagine if I could set things up this way the system could be lightening fast while keeping things on the network. Currently if I copy a large file (hundreds of MB) it is quite slow, with an SSD and caching, I would imagine the copy could be very fast.
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Jul 29, 2011
After installing 11.4 my fstab entries for CD and DVD drives as well as floppy generate errors when I try to mount them automatically or via Nautilus when inserting CD or DVD. The icons and CD/DVD name show up ok but will not mount. Manually mounting via terminal command works. Here are the relevant lines from fstab
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In /dev scd0 and scd1 are symlinks pointing to sr0 and sr1 respectively. The above error message was generated after attempting to load a CD in scd0 i.e. my laptop internal CD/DVD drive. Lines 10,11 and 12 are the fstab lines quoted above.
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Nov 15, 2010
I want to install Ubuntu 10.10 on the hard disk, but the partition table looks a lot different than in Windows. I have uploaded two screenshots, one of the Disk Management from Windows ( http://oi56.tinypic.com/15y9bgw.jpg ) and another one of GParted ( [URL].... ). Also, I can't mount any of the partitions.
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Dec 2, 2010
I have a 4gb SDHC card that has been partitioned with an ext2, linux swap, and fat 32 partition that I use in an Android phone. After I partitioned it this way, which I have done more than once with no problems, it quit mounting or being recognized by Android, Linux, or Windows. Windows can tell there is something there but can't mount it, Debian and Android just say it's not there. I need to try to fix the partition table which gparted told me was corrupt the last time gparted could see it.
Code:
# dmesg |grep sdb
[ 7.361926] sd 4:0:0:0: [sdb] Attached SCSI removable disk
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Feb 8, 2011
How do i disable the linux file cache on a xfs partition (both read an write).
We have a xfs partition over a hardware RAID that stores our RAW HD Video. Most of the shoots are 50-300gb each so the linux cache has a hit-rate of 0.001%.
I have tryed the sync option but it still fills up the cache when copinging the files. ( about 30x over per shoot :P )
/etc/fstab:
/dev/sdb1 /video xfs sync,noatime,nodiratime,logbufs=8 0 1
Im running debian lenny if it helps.
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Jun 2, 2010
I'm trying to add several cron jobs. I have a folder (/etc/cron.myapp) with several subfolders in it (30minute, 3minute, daily, hourly). Each of these folders contains a script.Runnng/usr/bin/run-parts /etc/cron.myapp/3minute/will execute the contents of that folder.I have tried adding the following entries to /etc/crontab with no luck, and nothing is showing up in /var/log/cron
*/3 * * * * /usr/bin/run-parts /etc/cron.myapp/3minute/
*/3 * * * * /usr/bin/run-parts /etc/cron.myapp/3minute
*/3 * * * * root /usr/bin/run-parts /etc/cron.myapp/3minute/
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May 2, 2010
I use two ramdisks one mounted in /tmp the other mounted as /ramdisk /tmp is used as a temp store for apps which need temp space /ramdisk is used to store copies of read only databases for processing. Files in here can be 10-500Mb in size.
I suspect that the O/S may be caching the files stored in /tmp and /ramdisk and thus is not efficient. How can I check if the O/S is caching ramdisk files and if this is the case how can I prevent it? Is there an option to say 'dont cache /tmp' ?
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Mar 29, 2009
simple installs of CentOS5.2 i386 on 2x Dell C640's and x86-64 on a Dell dimension 9150 resulted in the System/Administration menu offering two entries each with the name 'hardware' and the icon showing a little chip hovering over a PC. I did "add this launcher to panel" on both as an easy way of checking their properties:
The higher entry issues the command 'hwbrowser'
The lower entry issues the command 'hal-device-manager'
Both have the comment "view information on the hardware on this computer". I feel the hal-device-manager entry has the wrong name, comment, and icon. I think /etc/xdg/menus/system-settings.menu is relevant.
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Sep 24, 2009
I don't understand this error nor do I know how to solve the issue that is causing the error. Anyone care to comment?
Quote:
Error: Caching enabled but no local cache of //var/cache/yum/updates-newkey/filelists.sqlite.bz2 from updates-newkey
I know JohnVV. "Install a supported version of Fedora, like Fedora 11". This is on a box that has all 11 releases of Fedora installed. It's a toy and I like to play around with it.
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Jan 5, 2011
I was laughing about klackenfus's post with the ancient RH install, and then work has me dig up an old server that has been out of use for some time. It has some proprietary binaries installed that intentionally tries to hide files to prevent copying (and we are no longer paying for support or have install binaries), so a clean install is not preferable.
Basically it has been out of commission for so long, that the apt-get upgrade DL is larger than the /var partition (apt caches to /var/cache/apt/archives).
I can upgrade the bigger packages manually until I get under the threshold, but then I learn nothing new. So I'm curious if I can redirect the cache of apt to a specified folder either on the command line or via a config setting?
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Feb 27, 2011
I try to forward all the network traffic on specific port from my VPS to home PC.The problem is that I have dynamic IP at home so I've installed Dynamic Update Client (DUC) from no-ip.com.I also use 'redir' software on Centos VPS to redirect the traffic and everything works fine till my ISP change the IP of my home PC.Does Centos cache DNS queries by default (nscd is not running)?Is there a some way/software that will periodically check if the IP of particular domain has changed and update accordingly.
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Oct 26, 2009
I'd like to allow my laptop to be disconnected from the network and login with a user stored on LDAP. I know nscd can cache usernames and groups but not shadows, but is there a solution that will cache passwords?
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Apr 9, 2011
My past few weeks trying to cache the use frox, but never managed to run frox correctly. I need a guide for installation frox (ftp proxy or otherwise) that I can understand, because I'm still just learning. I use a superbly managed using squid for web proxy using port 3128
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Mar 6, 2011
I installed squid cache on my ubuntu server 10.10 and it is work fine but i want to know how to make it cache all files like .exe .mp3 .avi ....etc. and the other thing i want to know is how to make my client take the files from the cache in the full speed. since am using mikrotik system to use pppoe for clients and i match it with my ubuntu squid
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Nov 22, 2010
I am reading slab allocator, it defines slab cache, i am quite confuse is it same as hardware cache?
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Oct 23, 2009
what i need, I got two servers for about 4000 users and 300 servers and well the guy never setup dns caching right, so im redoing it. Now my goals
1) DNS cache
2) Transparent Squid Cache only
3) Load Balance - at switchlevel
Upgraded Hardrives to SSD 2x32gb each server 4gb of ram 2x Dell poweredge 850's - p4 2.8 (single cores) So any advise , pointers , expeirnces and best ways to do this being both server will do both dns caching and squid! Also is bind9 the best for this?? i seen stuff about DNSmasq what performs better( i dont need DHCP)
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Jun 28, 2010
On a full update centos 5.5 64 bit every day increases slab cache , specialy size-2048 eat a lot of memory ..
how can change this ? maybe a kernel bug ?
cat /proc/slabinfo
slabinfo - version: 2.1
# name <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> : tunables <limit> <batchcount> <sharedfactor> : slabdata <active_slabs> <num_slabs> <sharedavail>
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Mar 17, 2011
I am using Cent Os 5. I want to know that is there any way to check that how much size of squid cache directory is full? Normally when squid size will reach upto 2GB then I have to clean it.
# cache_dir ufs /var/spool/squid 2000 16 256
I assign 2000 MB to the cache size. One month have been pass while squid is running but i am unable to know how to check the current status of my squid cache size.
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