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Sysctl on Kernel 2.6.18-128.1.16.el5
by JohnS 07 Jul '09

07 Jul '09

Sysctl Values ------------------------------------------- net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.ipv4.tcp_rmem = 4096 87380 16777216 net.ipv4.tcp_wmem = 4096 65536 16777216 net.ipv4.tcp_window_scaling = 1 # vm.max-readahead = ? # vm.min-readahead = ? # HW Controler Off # max-readahead = 1024 # min-readahead = 256 # Memory over-commit # vm.overcommit_memory=2 # Memory to activate bdflush # vm.bdflush="40 500 0 0 500 3000 60 20 0" -------------------------------------------- What's the deal with the options with the "#"? Is the current kernel not supported any more? The ones not commented still work. I did not seem to notice this until migrating settings from a 5 machine not 5.1 but "5". I hate to ask such a dumb question but there seems to be no info from Up The Road Either. Error: sysctl -w "vm.min-readahead=256" error: "vm.min-readahead" is an unknown key Further more nothing is related in here[1] due to kernel parameter related changes. [1] http://www.centos.org/docs/5/html/release-notes/ \ RELEASE-NOTES-U3-en.html#sect-Release_Notes-Kernel_Related_Updates John

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Re: [CentOS] Permission problem
by Radu-Cristian FOTESCU 07 Jul '09

07 Jul '09

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server fails reboot - GRUB
by Rob Kampen 07 Jul '09

07 Jul '09

Hi All, Just wondering if anyone else has experienced a reboot problem. I have a intel motherboard based server of late 2004 vintage with 2 by 160GB SATA drives running linux software raid 1 with boot partition and /. The server was running 2.6.18-128.1.10 and had uptime of approx 40 days. I did a yum update and reboot yesterday and after the POST the screen showed GRUB From memory this indicates that the mbr is corrupt and grub cannot find the required files on /boot/grub (the first partition). I did a linux rescue from DVD which sets the HW raid 5 as /dev/sda and the two OS drives as sdb and sdc then ran grub and did grub> root(hd1,1) # designates that the root is to be found on the second partition of the second drive grub> setup(hd1) #writes the mbr onto the second drive (/dev/sdb) grub> root(hd2,1) # designates that the root is to be found on the second partition of the third drive grub> setup(hd2) #writes the mbr onto the third drive (/dev/sdc) grub> quit reboot ALL was well. Question is, what has happened in the last 40 days to the mbr(s)?? Not sure where to start looking. Any thoughts Thanks Rob

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GUI Front End for OpenLDAP admin (users & groups)
by Robert Heller 07 Jul '09

07 Jul '09

Does there exist a GUI Front End for OpenLDAP admin for CentOS 5 (RHEL 5)? The binary (i386) rpm for directory_adminstrator works just fine with CentOS 4, but does't install under CentOS 5 and the src RPM does not build (I hacked the spec file and did install the build deps, but it is using an old hack for finding libgnome (/usr/lib/gnomeConf.sh or something like that). I installed centos-ds, but this *looks* like it is a replacement OpenLDAP's slapd, which I don't want -- I have things set up and working with slapd and don't want to migrate things again. -- Robert Heller -- 978-544-6933 Deepwoods Software -- Download the Model Railroad System http://www.deepsoft.com/ -- Binaries for Linux and MS-Windows heller(a)deepsoft.com -- http://www.deepsoft.com/ModelRailroadSystem/

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Permission problem
by Niki Kovacs 07 Jul '09

07 Jul '09

Hi, I have to solve an apparently simple permission problem, and I don't know if it's the sunny weather or birdsong, well... I just can't figure it out. Here goes. I have a bunch of users in a public library. Some are "administrators": they handle the library, write the docs for everyone, etc. Then you have the "agents", who take care of lending books and fetch them when they get returned. And then you have the odd anonymous user, using the PC with a guest account. Let's make thing simple and start out with one machine. Every single user has a /home/<user> directory. Plus, I added the following directories: /home/pub and /home/echange Then, I created two groups, "administrators" and "agents". Here's what I'd like to achieve (but I think my IQ is just below the required limit :oD): 1) Members of the "administrators" group have unlimited read/write access to /home/pub and below. 2) Members of the "agents" group have read-only access to /home/pub and below. 3) All the others (that is, members of neither "administrators" and "agents") have no access at all to /home/pub, not even for listing the directory content. The thing is: I can't seem to formulate my problem in terms of user/group/others, as there are no owners, but two distinct groups involved. Any idea how to crack that nut? Niki

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Formatting print with awk and ORS
by Joseph L. Casale 07 Jul '09

07 Jul '09

I have a command I execute: awk 'BEGIN { ORS=" " } { print "\"" $1 "\"" }' input_file which gives me exactly what I need, all field one's in quotes on one line each separated by one space. I now need to print a single quote around all of this, but the ORS flag is screwing me up, it's causing every attempt I try to repeat for every record. Anyone got a pointer how to do this? Thanks! jlc

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dovecot autocreate home and /var/mail
by Eugene Vilensky 07 Jul '09

07 Jul '09

Hi, is there a way to make dovecot autocreate the home directory and the /var/mail/username mbox file? I have tons of users in /etc/passwd but they might never open a shell (where I have oddjobmkhome working), just pop/imap. Thanks!

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Init checking for processes that are configured to "respawn"
by Dirk H. Schulz 07 Jul '09

07 Jul '09

Hi folks, I have a sophisticated question for which I can't find any hints on the web: If you configure init (via /etc/inittab) to respawn processes (like the getty processes) when they exit - how often does init check for the existence of such a process? Does it check actively at all or does it rely on some kind of inter process communication? I am not a programmer, so maybe the second question is completely nonsense. Any hint or help is appreciated. Dirk

2 1

Memory reporting...
by John Doe 07 Jul '09

07 Jul '09

Hi, I have a little question about memory usage... When I do a free, I get: total used free shared buffers cached Mem: 18482800 18030668 452132 0 683068 9426792 -/+ buffers/cache: 7920808 10561992 But, when I do a ps, mysql is the only process that takes noticable memory; and it is far from 7.9GBs... USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND mysql 28346 36.0 15.6 3241196 2884692 ? Sl Jul04 981:19 \_ /usr/libexec/mysqld --basedir=/usr --datadir=/IOL/mysql --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --skip-external-locking --port=3306 --socket=/IOL/mysql/mysql.sock Once you removed the buffers and the cached memory from the total used memory... what is left? Looks like I have "something" (that is not buffers/cached) that takes more than 4GB... Could it be disk cache or is it included in the cached value? Any idea? Thx, JD

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yum install hangs
by Carlos Santana 07 Jul '09

07 Jul '09

Howdy, The yum install <package> hangs in between. This happened few days as well, but just after doing Ctrl+C it reported error with mirror and switched to another one. Today, however, it is not responding to Ctrl+C and kill or kill -9 command is also not working. Any clues? Thanks, CS.

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