Read Only Filesystem

Feb 26, 2008

I have a server with pacificrack. When I see my website it says "Read-Only File system" and my SSH dies with read-only file system errors.

It happens once per month, and the bad thing is I'm sleeping when it happens so I don't know my server is in this state.

Even though support fixes the problem within 15minutes of my support ticket, my server is down for hours because I don't know its down to then raise a ticket. I asked support why it happens and they never tell me... just tell me to read the logs but I'm not technical enough to understand linux logs etc.

Server is centos.

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Filesystem Became Read-only

Jun 4, 2007

Somehow the filesystem on my server turned read-only. The databases would not connect. When I rebooted the box it would not come up.

Support had to run FSCK. Even after, the databases had to be repaired using the CPanel tool. Things seem to be ok now, however:

1. What could have caused this to happen? Software or hardware failure?

2. I get these notifications, should I be worried?

WARNING: Kernel Errors Present
EXT3-fs error (device sda2): e...: 1 Time(s)

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Mount Tmp As Filesystem

Jun 6, 2009

I currently have a VPS. I have installed cPanel/WHM + CSF Firewall.

Everything is fine and all the ports are closed except for the ones I need.

I currently have some issues I need to fix, but google isn't helping


Check /tmp is mounted as a filesystemWARNING/tmp should be mounted as a separate filesystem with the noexec,nosuid options set

I tried googling this and there was a cPanel script but I do not have permission to run it. So does anyone mind explaining it to me one step at a time?


You should consider adding ini_set to the disable_functions in the PHP configuration as this setting allows PHP scripts to override global security and performance settings for PHP scripts. Adding ini_set can break PHP scripts and commenting out any use of ini_set in such scripts is advised

I have disabled this in php.ini but I do not know why it still says that I have to fix this

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Ext3 On A Very Large Filesystem

May 23, 2008

We're considering deploying a large server that will have 8x 500GB drives in a RAID-10 config. I intend to use a 3ware 9650SE w/ BBU along with A/B power to each of the PSU's.

My question is... since this will return into a 2TB array/partition, in event of a crash (kernel panic, etc -- I expect a power outage will be very, very rare if at all) what do you guys think the fsck time would be? In my experience a RAID BBU significantly drops it, sometimes to the point of no manual fsck required, but in event of a manual fsck shouldn't the BBU be able to provide more consistent data (less errors) and therefore a much shorter fsck? Maybe just recovering the journal?

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Check /var/tmp Is Mounted As A Filesystem

May 30, 2007

I have WHM/cPanel server.

I am installed ConfigServer (Firewall)

On configserver it says " /var/tmp should either be symlinked to /tmp or mounted as a filesystem" how can i do this?

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ISCSI Windows Clustered Filesystem

Oct 5, 2008

I'm currently connecting one of my servers to an iSCSI SAN but would like to hook up another server to that target as well. However, this doesn't work with NTFS filesystem and I couldn't really find any windows solutions for that. Does anyone have experience with this?

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Quotacheck: Can't Find Filesystem Cpanel

Mar 16, 2007

My /etc/fstab:

# cat /etc/fstab
# This file is edited by fstab-sync - see 'man fstab-sync' for details
LABEL=/1 / ext3 defaults,usrquota 1 1
LABEL=/boot /boot ext3 defaults 1 2
none /dev/pts devpts gid=5,mode=620 0 0
none /dev/shm tmpfs rw,noexec,nosuid,nodev 0 0
none /proc proc defaults 0 0
none /sys sysfs defaults 0 0
LABEL=SWAP-sda2 swap swap defaults 0 0
/dev/sdb1 /backups ext3 defaults 1 2

# /scripts/fixquotas

Installing Default Quota Databases...../aquota.user..../quota.user..../boot/aquota.user..../boot/quota.user..../backups/aquota.user..../backups/quota.user.....Done
Quotas are now on
Updating Quota Files......
quotacheck: Can't find filesystem to check or filesystem not mounted with quota option.
quotacheck: Can't find filesystem to check or filesystem not mounted with quota option.



root@srv01 [/www/logs]# /scripts/initquotas
Quotas are now on
Updating Quota Files......
quotacheck: Can't find filesystem to check or filesystem not mounted with quota option.
quotacheck: Can't find filesystem to check or filesystem not mounted with quota option.


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Optimal HDD And Filesystem Settings For Web Hosting

Dec 29, 2007

I am in the process of configuring my volumedrive dedicated server and would like some input on ideal settings for my filesystem.

I'd appreciate suggestions and explanations of what they options do.

Here is my system info:
Linux 2.6.18-53.el5 #1 SMP Mon Nov 12 02:14:55 EST 2007 x86_64 x86_64 x86_64 GNU/Linux
CentOS release 5 (Final)

AMD Sempron64 3000+

Location: SCSI device B
Cylinders: 60801
Size: 465.76 GB
Model: ATA ST3500320AS

Seagate Barracuda 7200.11 ST3500320AS 500GB 7200 RPM
32MB Cache SATA 3.0Gb/s Hard Drive

Parameters I can change:
EXT 3 File System Configuration Options:
Block size
Fragment size
Bytes per inode
Reserved blocks
Journal file size

Edit IDE Parameters
Transfer mode: Default mode / Disable IORDY / PIO mode 1,2,3,4 / Multimode DMA 0,1,2 / Ultra DMA 0,1,2
Using DMA: On/Off
Sector count: 256
Read-lookahead: On/Off
Write caching: On/Off
Interrupt unmask: On/Off
Keep settings over reset: On/Off
Keep features over reset: On/Off
Read only: On/Off
Reprogram best PIO: On/Off
Standby timeout: 0
32-bit I/O support: Disable / Enable / Enable with special sync sequence
Sector count for multiple sector I/O: Disable 2 4 8 16 32

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Postgres: Restoring A Filesystem Backup

Feb 19, 2007

i had to do a file system back up because of the size of my database.

i shutdown postmaster and tar'd the files.

i recently reloaded my OS and now i'm attempting to restore the backups. i first shut down postmaster, restored the backups to the data folder and restarted postmaster.

i then su'd from root to postgres user:

[postgres@austin1 pgsql]$ psql service_2_3
psql: FATAL: database "service_2_3" does not exist
DETAIL: The database subdirectory "base/16385" is missing.

the backups had a database named service_2_3 but upon restoring the backups, it doesn't seem to be available.

my data directory is /var/pgsql/data.

[postgres@austin1 pgsql]$ ls -lahR /var/pgsql/ | grep 16385
but that yielded nothing.

have i done something wrong while backing up? i don't think i have since i followed the postgres manual when backing up. but the administrators have not been very thorough with how they've set the system up for me.

how i can resolve this issue if you have the time.

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Installing Package Webmin-1.350-1 Needs 1 Inodes On The / Filesystem

Jul 31, 2007


Installing package webmin-1.350-1 needs 1 inodes on the / filesystem
Hmm, this is the first time I've encountered this error when installing Webmin and I have no idea what it means. My other servers doesnn't output this error.

What does it means by it needs 1 inodes on the filesystem?

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Writing Large Files - Risk Of Damaging Filesystem

Jan 19, 2008

Does writing large files (ie, 10GB backups in one archive) cause any risk of damaging a linux filesystem?

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Disk Space Error :: Filesystem Size Used Avail Use% Mounted On ...

Jul 25, 2008

i have a 32 GB hdd the results of df command are:

df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 32G 29G 715M 98% /
/dev/sda1 99M 14M 81M 15% /boot
tmpfs 1.5G 0 1.5G 0% /dev/shm
so there are 29GB used

but the du command shows only 19GB used:

du -hs /
19G /

where are the remaining 10GB from 19GB to 29GB?

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To Read Ftp Log

Mar 6, 2008

We have been working on a site for a while, couple of days ago I copied the source from the server - as there are few people making the changes to it - to get a fresh copy.

Yesterday I was blasted by my client that I have deleted files on the server and it had caused the site to go in disarray and they had to upload everything again.

I didn't delete anything, only copied, and after some arguments (naturally I am not happy with the allegation put on me) I was able to get the FTP log, but I don't really know how to read it, I am hoping that someone here would know and be able to assist:

HTML4Strict Code:
Tue Mar 04 16:49:29 2008 0 xx.xx.xx.xx 9365 /home/APP_NAME/public_html/user/add_room.php a _ i r xxxx ftp 1 * cTue Mar 04 18:20:02 2008 0 xx.xx.xx.xx 3909 /home/APP_NAME/public_html/About.php a _ o r xxxx ftp 1 * cTue Mar 04 18:20:04 2008 0 xx.xx.xx.xx 6046 /home/APP_NAME/public_html/affiliate-join.html a _ o r xxxx ftp 1 * cTue Mar 04 18:20:08 2008 0 xx.xx.xx.xx 6158 /home/APP_NAME/public_html/affiliate-join.php a _ o r xxxx ftp 1 * c

I have replaced the IP, application name with x.

I am guessing that *c means copy, but I don't want to make fool of myself when I confront them with this. Assuming that *c is copy what would be the command for delete?

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Read Only Errors

May 21, 2009

root@server [/backup/cpbackup/daily]# chmod 1777 /tmp
chmod: changing permissions of `/tmp': Read-only file system

root@server [/backup/cpbackup/daily]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 271G 135G 123G 53% /
/dev/sda1 99M 58M 36M 62% /boot
none 2.0G 0 2.0G 0% /dev/shm
/dev/sdb1 135G 80G 49G 63% /backup
/usr/tmpDSK 4.9G 64M 4.5G 2% /tmp
/tmp 4.9G 64M 4.5G 2% /var/tmp ....

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Mod_mime_magic: Can't Read

Oct 27, 2009

Does anyone know what this error means in my error_log:

[Tue Oct 27 14:00:17 2009] [error] [client] mod_mime_magic: can't read `/var/www/vhosts/', referer: [url]

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Htaccess Not Being Read

Apr 1, 2008

I just hired my first dedicated server and I don't get why but it is like if it is not reading my htaccess files for mod_rewrite.

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R 32 Bit Systems Can Not Read More Than 4 Gb Ram?

Aug 28, 2008

r 32 bit systems can not read more than 4 gb ram ??

r any thing in kernel to do fix it

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Read The Cpanel Log

Oct 22, 2007

I received email from my cpanel server as follow:

IMPORTANT: Do not ignore this email.

This is cPanel stats runner on! While processing the log files for user xxxx, the cpu has been maxed out for more than a 6 hour period. The current load/uptime line on the server at the time of this email is 18:46:25 up 59 days, 13:16, 0 users, load average: 2.24, 2.23, 2.25

You should check the server to see why the load is so high and take
steps to lower the load. If you want stats to continue to run even with a high load

So what does this mean? and how can i check out this? how to reduce the cpu usage? Where to see the current usage?

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What Happens If You Forget To Read TOS

May 17, 2007

About a month ago, I searched desperately for days to host my social networking site and file hosting site. Thankfully I found Wiredtree(WT) to be suitable for my budget. I signed with them with their entry plan of $44.10 and was happy with their service. The customer support was extremely helpful and they did everything to make my life better.

Nevertheless my project didn't turn up as expected and I decided to close the hosting.

Just a day before the end of one month of hosting, I wrote to them asking to close the account and also congratulating their service I also told them I would look forward to host with them in future and would recommend them. I expected a warm termination without any hassle. But i got a mail quoting their TOS (which says I should inform them 7 days in advance) and asking me to pay up another month's hosting fee before I can close the account. Along with it was a note from the staff to use the client portal to contact Billing Department directly to close the account (hmmm would they ask me to contact sales department directly if I tell me I want to add new server?). What hurt me was not the extra $44.10 which I will pay them anyway, but what they could have done was to understand my genuine case(first time customer). Tell me, how many of us read the TOS really. I requested them not to charge me, but got same cold response asking me to adhere to the TOS.

On the other hand my experience with other host (PM me if you want to know who) was one of awe and amazement. I wrote asking them the price I should pay to have more bandwidth. To my surprise I got extra bandwidth absolutely free though it wasn't mentioned such things in their TOS.

Well I learned a lesson today not to forget the importance of TOS and i am sure new webmasters will find this post useful.

This thread is not against the WT service. But a warning to new webmasters who might miss the fine print.

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Read Emails

Aug 18, 2007

I got 2 questions:

Are deleted emails kept on the server?

2nd, how do I view deleted emails from different accounts?

I have root access to my box so I can use SSH etc to get in...

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Read-only System 3rd Time

Jun 11, 2009

I have brand new server with CentOS 5.3 and latest CentOS kernel (2.6.18-128.1.10.el5PAE).

I have brand new HDDs with no errors (HDDs have only 1000 power-on-hours, server CPU temperature is normal - between 35-42 C). My server went read-only without any reason. I need to fsck main / partition (/home is separated) and it cleaned journal, then server became online.

After 2 weeks it happens again - I did again fsck on / partition and it recovered journal as before. I decided to ask Data Center to replace RAID-1 card and memory - they did it. After 3 weeks server went read-only again.

I ssh into server and saw that kswapd0 process is using 100% cpu and load is over 170.

After fsck it recovered journal on / and server is again available.

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Server Became Read Only System

Mar 29, 2009

I had a linux server (CentOs 5, mysql5, php5, directadmin). I had problems with apache few days ago, that's why i hire sys. admin who tweak the system (install the PAE kernel), and some more configurations, and during last 7-8 days server work w/o any downtime (before this server had 1-2 downtimes per day-> OOM killer.)

Now i had only ssh access (emails, directadmin access - give "wrong password" answer). As told my sys.admin It became read only system.

I cann't even reboot system


[root@server sa]# reboot
reboot: /usr/local/lib/ no version information available (required by /usr/lib/

such few commands work, the most commands that i know don't work


[root@server ~]# ls -la
ls: error while loading shared libraries: cannot open shared object file: No such file or directory

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Warning: READ HERE

Dec 11, 2008

I just thought I would riase an issue you with you about the following host:
The reason:

I have received a number of e-mails over the last 2weeks that look like they are from my bank asking me to log-in and update my security information. I no my bank doe's not ever do this so I contacted them. When sending on the mail to them, they where able to trace the e-mail and it took them back to the address listed above using the e-mail account

So before you hand over your bank account details to them I highly recommend that think twice.

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Unable To Read Data

May 20, 2007

i have a dedicated server with cpanel and when trying to addd any accounts i get the message dns zone already exists but when i go to edit a dns zone to check i am getting the message below

Unable to read data from /dev/urandom (No such file or directory).

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Anyone Know How To Read Email Headers

Jul 8, 2007

I'd love to contact the domain registrars of the recipient spammers who are barraging me with the latest "google riches", or "ebay success" sales pitch emails, but I lack the knowledge of how to reveal the email headers and interpret them.

Is there a particular email client program that would allow me to view all parts of the email ? Maybe I'm using the wrong client (outlook), that would not allow me to view the more technical parts of the email, but but I don't know.

If I go ahead and click on their "unsub me" links at their bottom, that's their tricky way of finding out what emails are active and possibly make it worse for me. I know that it's illegal to send me email that I didn't opt into, in the first place, even if they do provide the unsubscribe link at the bottom, with the usual "Icann" spam disclaimer that they include.

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Onboard Raid 1 (Read Only After Testing)

Oct 27, 2009

I have a server with 2 hard drives.

1. I configured the onboard Raid 1, both as Volume0

I installed CentOS successfully. So I tested the RAID to see if the mirror really works

2. I took out hddA and boot hddB as single drive. it work!

3. Then I took out hddB and boot hddA as single drive. it work!

4. Then I plug back hddA & hddB back together & boot it up

It gives me many error screen, I had to login as repair screen with root password. It says everything is read-only. So I try to remount but it fails

#e2fsck -y /dev/sda1
#mount -t ext2 -o rw,remount /dev/sda1 /
#mount -n -o remount ext2 /dev/sda1 /
#mount -o remount,rw /

None above works. I wonder if I am not suppose to do that way the first place?

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How To Read CPU Temperature On CentOS 4.6 And 2.6.9 Kernel

Jul 30, 2008

how to read CPU Temperature on CentOS 4.6. and kernel 2.6.9 (CentOS kernel from yum)

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Enabled Suphp But Still Can Read /etc/passwd

Nov 8, 2008

It there any good way to stop using from reading /etc/passwd?

I have suPHP enabled and open_basedir enabled by WHM too. But it seems susphp ignores open_basedir restrictions?

Here is virtual host config:

<VirtualHost x.x.x.x:80>
<IfModule concurrent_php.c>
php4_admin_value open_basedir "/home/xxx/:/usr/lib/php:/usr/php4/lib/php:/usr/local/lib/php:/usr/local/php4/lib/p$
php5_admin_value open_basedir "/home/xxx/:/usr/lib/php:/usr/local/lib/php:/tmp"
<IfModule !concurrent_php.c>
<IfModule mod_php4.c>
php_admin_value open_basedir "/home/xxx/:/usr/lib/php:/usr/php4/lib/php:/usr/local/lib/php:/usr/local/php4/li$
<IfModule mod_php5.c>
php_admin_value open_basedir "/home/xxx/:/usr/lib/php:/usr/local/lib/php:/tmp"
<IfModule sapi_apache2.c>
php_admin_value open_basedir "/home/xxx/:/usr/lib/php:/usr/php4/lib/php:/usr/local/lib/php:/usr/local/php4/li$
DocumentRoot /home/xxx/public_html
UseCanonicalName Off
CustomLog /usr/local/apache/domlogs/ combined
CustomLog /usr/local/apache/domlogs/ "%{%s}t %I .
%{%s}t %O ."
## User xxx # Needed for Cpanel::ApacheConf
<IfModule mod_suphp.c>
suPHP_UserGroup xxx xxx
<IfModule !mod_disable_suexec.c>
SuexecUserGroup xxx xxx
ScriptAlias /cgi-bin/ /home/xxx/public_html/cgi-bin/
DocumentRoot /home/xxx/public_html
UseCanonicalName Off
CustomLog /usr/local/apache/domlogs/ combined
CustomLog /usr/local/apache/domlogs/ "%{%s}t %I .
%{%s}t %O ."
## User xxx # Needed for Cpanel::ApacheConf
<IfModule mod_suphp.c>
suPHP_UserGroup xxx xxx
<IfModule !mod_disable_suexec.c>
SuexecUserGroup xxx xxx
ScriptAlias /cgi-bin/ /home/xxx/public_html/cgi-bin/
# To customize this VirtualHost use an include file at the following location
# Include "/usr/local/apache/conf/userdata/std/2/xxx/*.conf"


Scripts are running with user's UID, and that is fine, but it can still read /etc/passwd file for example.

How to fix that? Is it really open_basedir value is ignored by susphp? It works fine if I remove suphp and run scripts with nobody uid.

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