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mail server best practices question
by Coert 11 May '10

11 May '10

Hello all, About a year ago I set up a mail server on CentOS using this howto: http://wanderingbarque.com/howtos/mailserver/mailserver.html I managed to add amavisd-new with clamav and spamassassin. It runs very well, but it runs on CentOS 5.2, and if I try to upgrade, amavisd-new and clamav break. we are now also at the point where a backup mx will need to be implemented. If necessary I am willing to implement a new mail server and a new backup mx. What I would like to know is what solution you guys would recommend for the mail server and the backup MX? Any pointers would be greatly appreciated. Regards, Coert

13 23

Text file manipulation in CentOS?
by hadi motamedi 11 May '10

11 May '10

Dear All >From my previous posts , I learned from you to make use of 'sort' , 'grep' , and 'grep -v' to manipulate text files . At now, I have generated a large text file from my autoexpect script. To be more specific, I need to find how many distinct records are there in say column#1? How can I filter out the distinct records with number of occurances less than a pre-determined threshold?Can you please show my the power of CentOS in manipulating text files? Thank you

2 1

tracing the source of a sector error from smartd
by nate 10 May '10

10 May '10

I'm not used to using smartd, but have a new set of systems that don't have any sort of RAID on them, so I enabled smartd (18 systems 4 SATA drives each). Running CentOS 5.4 64-bit .. One of them has emailed me twice(despite it saying it would only email me once) saying it has 1 Offline uncorrectable sectors But when I try to find more information, smartctl seems to think everything is fine. === START OF INFORMATION SECTION === Device Model: WDC WD1002FBYS-18W8B0 Serial Number: WD-WMATV5930306 Firmware Version: 03.00C09 User Capacity: 1,000,204,886,016 bytes Device is: Not in smartctl database [for details use: -P showall] ATA Version is: 8 ATA Standard is: Exact ATA specification draft version not indicated Local Time is: Mon May 10 16:36:22 2010 PDT SMART support is: Available - device has SMART capability. SMART support is: Enabled === START OF READ SMART DATA SECTION === SMART overall-health self-assessment test result: PASSED General SMART Values: Offline data collection status: (0x82) Offline data collection activity was completed without error. Auto Offline Data Collection: Enabled. Self-test execution status: ( 0) The previous self-test routine completed without error or no self-test has ever been run. Total time to complete Offline data collection: (18000) seconds. Offline data collection capabilities: (0x7b) SMART execute Offline immediate. Auto Offline data collection on/off support. Suspend Offline collection upon new command. Offline surface scan supported. Self-test supported. Conveyance Self-test supported. Selective Self-test supported. SMART capabilities: (0x0003) Saves SMART data before entering power-saving mode. Supports SMART auto save timer. Error logging capability: (0x01) Error logging supported. General Purpose Logging supported. Short self-test routine recommended polling time: ( 2) minutes. Extended self-test routine recommended polling time: ( 208) minutes. Conveyance self-test routine recommended polling time: ( 5) minutes. SCT capabilities: (0x303f) SCT Status supported. SCT Feature Control supported. SCT Data Table supported. SMART Attributes Data Structure revision number: 16 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 0 3 Spin_Up_Time 0x0027 253 253 021 Pre-fail Always - 1091 4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 15 5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0 7 Seek_Error_Rate 0x002e 100 253 000 Old_age Always - 0 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 523 10 Spin_Retry_Count 0x0032 100 253 000 Old_age Always - 0 11 Calibration_Retry_Count 0x0032 100 253 000 Old_age Always - 0 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 14 192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 13 193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 1 194 Temperature_Celsius 0x0022 117 109 000 Old_age Always - 33 196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0 197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 1 198 Offline_Uncorrectable 0x0030 200 200 000 Old_age Offline - 1 199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0 200 Multi_Zone_Error_Rate 0x0008 200 200 000 Old_age Offline - 1 SMART Error Log Version: 1 No Errors Logged SMART Self-test log structure revision number 1 Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error # 1 Extended offline Completed without error 00% 68 - # 2 Short offline Completed without error 00% 60 - SMART Selective self-test log data structure revision number 1 SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS 1 0 0 Not_testing 2 0 0 Not_testing 3 0 0 Not_testing 4 0 0 Not_testing 5 0 0 Not_testing Selective self-test flags (0x0): After scanning selected spans, do NOT read-scan remainder of disk. If Selective self-test is pending on power-up, resume after 0 minute delay. --- /var/log/messages has tons of entries that say Device: /dev/sdc, 1 Currently unreadable (pending) sectors Since it's only 1 disk out of 72 I suspect it's the disk at fault rather than something with smartd.. Any ideas? thanks nate

1 0

Number and colon precedes some package names in yum.log
by Keith Christian 10 May '10

10 May '10

What is the meaning of the "4:", "2:", "30:" and "1:" prefixes for the following entries in yum.log? Most entries in yum.log don't have them. grep "Installed: [0-9]*:" /var/log/yum.log May 07 16:45:53 Installed: 4:perl-5.8.8-27.el5.i386 May 07 16:58:21 Installed: 2:xinetd-2.3.14-10.el5.i386 May 07 17:03:43 Installed: 30:bind-libs-9.3.6-4.P1.el5_4.2.i386 May 07 17:03:43 Installed: 30:bind-utils-9.3.6-4.P1.el5_4.2.i386 May 07 17:12:28 Installed: 1:telnet-0.17-39.el5.i386

2 1

ibmasm service
by Janez Kosmrlj 10 May '10

10 May '10

Does someone have any info on this service. It's supposed to configure and have the tools to communicate with the ibm RSA. I am looking for a procedure to configure the RSA without using the bios and when possible set a access password. Is this the right tool to do this or am i misunderstanding something. Regards Janez

2 4

USB key installed OS; file system goes read-only randomly...
by Jason Pyeron 10 May '10

10 May '10

This happened a few times now, I (soft) reboot and do the fsck thing and all is fine until it happens again. Any ideas? [root@test-dhcp ~]# yum remove bluez-libs bluez-utils Loaded plugins: fastestmirror Setting up Remove Process Resolving Dependencies <snip/> Finished Transaction Test Transaction Test Succeeded Running Transaction Erasing : bluez-utils 1/3 Erasing : bluez-libs 2/3 Traceback (most recent call last): File "/usr/lib/python2.4/site-packages/yum/rpmtrans.py", line 376, in callback self._unInstStop( bytes, total, h ) File "/usr/lib/python2.4/site-packages/yum/rpmtrans.py", line 479, in _unInstStop self.ts_done(h, action) File "/usr/lib/python2.4/site-packages/yum/rpmtrans.py", line 307, in ts_done misc.unlink_f(self.ts_done_fn) File "/usr/lib/python2.4/site-packages/yum/misc.py", line 777, in unlink_f os.unlink(filename) OSError: [Errno 30] Read-only file system: '/var/lib/yum/transaction-done.2010-05-06.15:18.05' error: python callback <bound method RPMTransaction.callback of <yum.rpmtrans.RPMTransaction instance at 0x9fddeac>> failed, aborting! [root@test-dhcp ~]# > /tmp/test -bash: /tmp/test: Read-only file system [root@test-dhcp ~]# mount -n -o remount,rw / mount: block device /dev/VolGroup00/LogVol00 is write-protected, mounting read-only [root@test-dhcp ~]# fdisk -l /dev/sda Disk /dev/sda: 4105 MB, 4105175040 bytes 255 heads, 63 sectors/track, 499 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 499 3903795 8e Linux LVM [root@test-dhcp ~]# > /boot/foo [root@test-dhcp ~]# rm /boot/foo rm: remove regular empty file `/boot/foo'? y [root@test-dhcp ~]# > /tmp/foo -bash: /tmp/foo: Read-only file system [root@test-dhcp ~]# Was tailing logs when it happened: [root@test-dhcp ~]# tail -f /var/log/dmesg /var/log/secure /var/log/messages /var/log/faillog ==> /var/log/dmesg <== md: ... autorun DONE. device-mapper: multipath: version 1.0.5 loaded EXT3 FS on dm-0, internal journal kjournald starting. Commit interval 5 seconds EXT3 FS on sda1, internal journal EXT3-fs: mounted filesystem with ordered data mode. SELinux: initialized (dev sda1, type ext3), uses xattr SELinux: initialized (dev tmpfs, type tmpfs), uses transition SIDs Adding 917496k swap on /dev/VolGroup00/LogVol01. Priority:-1 extents:1 across:917496k SELinux: initialized (dev binfmt_misc, type binfmt_misc), uses genfs_contexts ==> /var/log/secure <== May 6 14:51:08 test-dhcp sshd[2237]: Server listening on :: port 22. May 6 14:51:08 test-dhcp sshd[2237]: error: Bind to port 22 on 0.0.0.0 failed: Address already in use. May 6 14:53:07 test-dhcp login: pam_unix(login:session): session opened for user root by (uid=0) May 6 14:53:09 test-dhcp login: ROOT LOGIN ON tty1 May 6 15:04:05 test-dhcp sshd[2258]: Server listening on :: port 22. May 6 15:04:05 test-dhcp sshd[2258]: error: Bind to port 22 on 0.0.0.0 failed: Address already in use. May 6 15:04:28 test-dhcp sshd[2385]: Connection closed by 192.168.4.12 May 6 15:04:39 test-dhcp sshd[2387]: Accepted password for root from 192.168.4.12 port 4794 ssh2 May 6 15:04:40 test-dhcp sshd[2387]: pam_unix(sshd:session): session opened for user root by (uid=0) ==> /var/log/messages <== May 6 15:05:04 test-dhcp kernel: Bluetooth: Core ver 2.10 May 6 15:05:04 test-dhcp kernel: NET: Registered protocol family 31 May 6 15:05:04 test-dhcp kernel: Bluetooth: HCI device and connection manager initialized May 6 15:05:04 test-dhcp kernel: Bluetooth: HCI socket layer initialized May 6 15:05:04 test-dhcp kernel: Bluetooth: L2CAP ver 2.8 May 6 15:05:04 test-dhcp kernel: Bluetooth: L2CAP socket layer initialized May 6 15:05:04 test-dhcp kernel: Bluetooth: RFCOMM socket layer initialized May 6 15:05:04 test-dhcp kernel: Bluetooth: RFCOMM TTY layer initialized May 6 15:05:04 test-dhcp kernel: Bluetooth: RFCOMM ver 1.8 May 6 15:05:05 test-dhcp kernel: Bluetooth: HIDP (Human Interface Emulation) ver 1.1 ==> /var/log/faillog <== ==> /var/log/secure <== May 6 15:05:51 test-dhcp sshd[2504]: Accepted password for root from 192.168.4.12 port 4795 ssh2 May 6 15:05:52 test-dhcp sshd[2504]: pam_unix(sshd:session): session opened for user root by (uid=0) ==> /var/log/messages <== May 6 15:06:46 test-dhcp yum: Erased: redhat-lsb May 6 15:07:41 test-dhcp yum: Erased: cups May 6 15:09:23 test-dhcp yum: Erased: avahi-compat-libdns_sd May 6 15:10:29 test-dhcp avahi-daemon[2383]: Got SIGTERM, quitting. May 6 15:10:29 test-dhcp avahi-daemon[2383]: Leaving mDNS multicast group on interface eth0.IPv6 with address fc00::30:18ae:6b84. May 6 15:10:29 test-dhcp avahi-daemon[2383]: Leaving mDNS multicast group on interface eth0.IPv4 with address 192.168.22.23. May 6 15:10:29 test-dhcp yum: Erased: avahi May 6 15:18:06 test-dhcp sdpd[2073]: terminating... May 6 15:18:06 test-dhcp hcid[2069]: Unregister path:/org/bluez May 6 15:18:06 test-dhcp hcid[2069]: Exit May 6 15:18:06 test-dhcp hidd[2210]: Exit May 6 15:18:07 test-dhcp kernel: Bluetooth: BNEP (Ethernet Emulation) ver 1.2 May 6 15:18:07 test-dhcp kernel: Bluetooth: BNEP filters: protocol multicast May 6 15:18:07 test-dhcp yum: Erased: bluez-utils -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - Jason Pyeron PD Inc. http://www.pdinc.us - - Principal Consultant 10 West 24th Street #100 - - +1 (443) 269-1555 x333 Baltimore, Maryland 21218 - - - -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- This message is copyright PD Inc, subject to license 20080407P00.

4 6

which gcc package?
by Michael Klinosky 09 May '10

09 May '10

Hello. I tried to compile a program (plugger), but I don't have *any* sort of compiler installed. This is on Cent5.3. So, I used Package Manager, concentrating on gcc. But, it seems that I have a choice, thus: gcc-4.1.2-46.el5.i386 gcc-4.1.2-46.el5_4.1.i386 gcc-4.1.2-46.el5_4.2.i386 gcc-c++-4.1.2-46.el5.i386 gcc-c++-4.1.2-46.el5_4.1.i386 gcc-c++-4.1.2-46.el5_4.2.i386 ... along with some others (Fortran, Ada, Java, and Obj-C). I'm thinking that I need only 1 'flavor' (say, gcc-4.1.2-46.el5.i386 and gcc-c++-4.1.2-46.el5.i386) - correct? I tried a google.com/linux search - the only link that seemed helpful was http://gcc.gnu.org/ -- where I found only this: "The core distribution includes the C language front end as well as the shared components." I have no clue which package would be the FE, and what the shared components are. Perhaps 1 of those packages is the core?

7 12

Broken upgrade to memcached
by m.roth＠5-cent.us 09 May '10

09 May '10

Yum checkupdate tells me I should update memcached, that the x86_64 1.4.5-1.el5 needs an update, I go to do that, and it complains that it's missing a dependency of libevent-1.4.so.2 (this is all 64 bit, CentOS 5.4). Clues... or is this actually broken? mark

7 20

Vim - In INSERT Mode, the Backspace key does not work
by Wang, Mary Y 09 May '10

09 May '10

Hi All, I'm not very good with Vim. I noticed when it is in INSERT Mode, the backspace key no longer works. How to do I configure it so that it will work with the backspace key? Any ideas? Thanks Mary

2 4

ldap: adding user to multiple groups
by aurfalien＠gmail.com 08 May '10

08 May '10

Hi all, Not having much luck adding a user to more then 1 group in OpenLDAP thats provided in Centos. Any suggestions to have the outcome of having a user belong to multiple groups? Should I create a new group that has multiple GIDs and assign a user to that new group? If so, how? :) Thanks in advance.

5 19

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