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  • One Linux server has two timer

    - by garconcn
    The time on one of our Linux box is very weird. Whenever I call date 3 times, the 4th call will give a wrong time(usually 1 hour later). I have setup cron to sync with ntp server. We have 20+ similar servers, only this one has this problem. Any idea? Thanks. Linux 2.6.18-6-686 #1 SMP Thu Aug 20 21:56:59 UTC 2009 i686 GNU/Linux :~# date Fri Jun 11 17:00:51 PDT 2010 :~# date Fri Jun 11 17:00:52 PDT 2010 :~# date Fri Jun 11 17:00:53 PDT 2010 :~# date Fri Jun 11 18:14:12 PDT 2010 :~# date Fri Jun 11 17:00:55 PDT 2010 :~# date Fri Jun 11 17:00:56 PDT 2010 :~# date Fri Jun 11 17:00:56 PDT 2010 :~# date Fri Jun 11 18:14:15 PDT 2010 :~# date Fri Jun 11 17:00:58 PDT 2010 :~# date Fri Jun 11 17:00:58 PDT 2010 :~# date Fri Jun 11 17:00:59 PDT 2010 :~# date Fri Jun 11 18:14:18 PDT 2010 :~# date Fri Jun 11 17:01:01 PDT 2010 :~# date Fri Jun 11 17:01:01 PDT 2010 :~# date Fri Jun 11 17:01:02 PDT 2010 :~# date Fri Jun 11 18:14:21 PDT 2010 :~# date Fri Jun 11 17:01:03 PDT 2010 :~# date Fri Jun 11 17:01:04 PDT 2010 :~# date Fri Jun 11 17:01:05 PDT 2010

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  • How to connect SAN from CentOS through two iSCSI Targets

    - by garconcn
    I had asked the similar question before. This time I want to use subnet for two iSCSI Targets, hence I start a new question. I have an old Promise VTrak M500i SAN Server. It comes with 2 iSCSI ports. I want to connect to two LUNs on the SAN server through two separate Targets from CentOS 5.7 64bits server. My network setup is as follows: CentOS server: Management network - 192.168.1.1 Storage network 1 - 192.168.5.2 Storage network 2 - 192.168.6.2 Promise SAN server: Management network - 192.168.1.2 iSCSI Port 1 - 192.168.5.1 iSCSI Port 2 - 192.168.6.1 I have two Logical Drives on this SAN and they are mapped as follows: Index Initiator Name LUN Mapping 0 iqn.2011-11:backup (LD0,0) 1 iqn.2011-11:template (LD1,1) Basically, I want the traffic to iqn.2011-11:backup LUN 0 through 192.168.5.1 network the traffic to iqn.2011-11:template LUN 1 through 192.168.6.1 network I don't use MPIO, just want to separate the traffic to avoid traffic jam. How do I achieve this? I am new to SAN stuff, please explain as much detail as you can. Thank you. The following are what I am doing now. After mapping the LUN to my pre-defined Initiators, the CentOS server can discover both Targets. [root@centos ~]# iscsiadm -m discovery -t sendtargets -p 192.168.5.1 192.168.5.1:3260,1 iscsi-1 192.168.6.1:3260,2 iscsi-1 [root@centos ~]# iscsiadm -m discovery -t sendtargets -p 192.168.6.1 192.168.6.1:3260,2 iscsi-1 192.168.5.1:3260,1 iscsi-1 [root@centos ~]# /etc/init.d/iscsi start iscsid is stopped Starting iSCSI daemon: [ OK ] [ OK ] Setting up iSCSI targets: Logging in to [iface: default, target: iscsi-1, portal: 192.168.6.1,3260] Logging in to [iface: default, target: iscsi-1, portal: 192.168.5.1,3260] Login to [iface: default, target: iscsi-1, portal: 192.168.6.1,3260] successful. Login to [iface: default, target: iscsi-1, portal: 192.168.5.1,3260] successful. [ OK ] [root@centos ~]# iscsiadm -m session tcp: [1] 192.168.6.1:3260,2 iscsi-1 tcp: [2] 192.168.5.1:3260,1 iscsi-1 When I check the LUN mapping on the SAN server for the two Logical Drives, both LUNs are connected through Port0-192.168.5.2 with the Initiator defined in CentOS. Assigned Initiator List: Initiator Name Alias IP Address LUN iqn.2011-11.centos centos.mydomain.com Port0-192.168.5.2 0 Initiator Name Alias IP Address LUN iqn.2011-11.centos centos.mydomain.com Port1-192.168.5.2 1 I assume the following is what I want: Initiator Name Alias IP Address LUN iqn.2011-11.backup centos.mydomain.com Port0-192.168.5.2 0 Initiator Name Alias IP Address LUN iqn.2011-11.template centos.mydomain.com Port0-192.168.6.2 1

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  • Why an empty MAIL FROM address can sent out email?

    - by garconcn
    We are using Smarter Mail system. Recently, we found that hacker had hacked some user accounts and sent out lots of spams. We have firewall to ratelimit the sender, but for the following email, the firewall couldn't do this because of the empty FROM address. Why an empty FROM address is consider OK? Actually, in our MTA(surgemail), we can see the sender in the email header. Any idea? Thanks. 11:17:06 [xx.xx.xx.xx][15459629] rsp: 220 mail30.server.com 11:17:06 [xx.xx.xx.xx][15459629] connected at 6/16/2010 11:17:06 AM 11:17:06 [xx.xx.xx.xx][15459629] cmd: EHLO ulix.geo.auth.gr 11:17:06 [xx.xx.xx.xx][15459629] rsp: 250-mail30.server.com Hello [xx.xx.xx.xx] 250-SIZE 31457280 250-AUTH LOGIN CRAM-MD5 250 OK 11:17:06 [xx.xx.xx.xx][15459629] cmd: AUTH LOGIN 11:17:06 [xx.xx.xx.xx][15459629] rsp: 334 VXNlcm5hbWU6 11:17:07 [xx.xx.xx.xx][15459629] rsp: 334 UGFzc3dvcmQ6 11:17:07 [xx.xx.xx.xx][15459629] rsp: 235 Authentication successful 11:17:07 [xx.xx.xx.xx][15459629] Authenticated as [email protected] 11:17:07 [xx.xx.xx.xx][15459629] cmd: MAIL FROM: 11:17:07 [xx.xx.xx.xx][15459629] rsp: 250 OK < Sender ok 11:17:07 [xx.xx.xx.xx][15459629] cmd: RCPT TO:[email protected] 11:17:07 [xx.xx.xx.xx][15459629] rsp: 250 OK Recipient ok 11:17:08 [xx.xx.xx.xx][15459629] cmd: DATA

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  • Why an empty MAIL FROM address can sent out email?

    - by garconcn
    We are using Smarter Mail system. Recently, we found that hacker had hacked some user accounts and sent out lots of spams. We have firewall to ratelimit the sender, but for the following email, the firewall couldn't do this because of the empty FROM address. Why an empty FROM address is consider OK? Actually, in our MTA(surgemail), we can see the sender in the email header. Any idea? Thanks. 11:17:06 [xx.xx.xx.xx][15459629] rsp: 220 mail30.server.com 11:17:06 [xx.xx.xx.xx][15459629] connected at 6/16/2010 11:17:06 AM 11:17:06 [xx.xx.xx.xx][15459629] cmd: EHLO ulix.geo.auth.gr 11:17:06 [xx.xx.xx.xx][15459629] rsp: 250-mail30.server.com Hello [xx.xx.xx.xx] 250-SIZE 31457280 250-AUTH LOGIN CRAM-MD5 250 OK 11:17:06 [xx.xx.xx.xx][15459629] cmd: AUTH LOGIN 11:17:06 [xx.xx.xx.xx][15459629] rsp: 334 VXNlcm5hbWU6 11:17:07 [xx.xx.xx.xx][15459629] rsp: 334 UGFzc3dvcmQ6 11:17:07 [xx.xx.xx.xx][15459629] rsp: 235 Authentication successful 11:17:07 [xx.xx.xx.xx][15459629] Authenticated as [email protected] 11:17:07 [xx.xx.xx.xx][15459629] cmd: MAIL FROM: 11:17:07 [xx.xx.xx.xx][15459629] rsp: 250 OK < Sender ok 11:17:07 [xx.xx.xx.xx][15459629] cmd: RCPT TO:[email protected] 11:17:07 [xx.xx.xx.xx][15459629] rsp: 250 OK Recipient ok 11:17:08 [xx.xx.xx.xx][15459629] cmd: DATA

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  • How to set expiration date for external files? [closed]

    - by garconcn
    I have a site included lots of external files, most of them are gif format. I have no control on the external files, but have to use them(with permission). When I check the site using Google Pagespeed, I got very low score(31) even though the page load is fast. One of the high priority suggestion is to leverage browser caching by setting an expiration date. However, all the files are on external links. I have already set the expiration date for local files.

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  • CentOS default installation gave 60% disk space to tmpfs partition

    - by garconcn
    I installed a CentOS server which will be used for xen hypervisor. The server has two Intel(R) Xeon(R) CPU E5620 and 148G memory. The OS was installed on a 120G SSD drive. After the installation, I found that the tmpfs partition occupied about 60% of the drive. Even though I don't need much space for the OS, will there be any problem with 71G tmp partition? Thanks for any comment. [root@cloud ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 55G 1.1G 51G 3% / /dev/sda1 99M 13M 82M 14% /boot tmpfs 71G 0 71G 0% /dev/shm

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  • Why my Ldirectord check multiple times on read server every interval?

    - by garconcn
    I have a Ldirectord server and two real servers. My ldirectord used to check the request page on real server once in every interval, but now I found that it check four times. I have monitored the log on both real servers, they have the same problem. Here is my ldirectord configuration: checktimeout=10 checkinterval=5 autoreload=yes logfile="/var/log/ldirectord.log" quiescent=no virtual=192.168.1.100:80 fallback=127.0.0.1:80 real=192.168.1.10:80 gate real=192.168.1.20:80 gate service=http request="lb.html" receive="still alive" scheduler=sh persistent=60 protocol=tcp checktype=negotiate Ldirectord will connect to each real server once every 5 seconds (checkinterval) and request 192.168.0.10:80/test.html (real/request). The access log in real server: 192.168.1.100 - - [13/Jun/2012:10:36:44 -0700] "GET /lb.html HTTP/1.1" 200 12 "-" "libwww-perl/5.805" 192.168.1.100 - - [13/Jun/2012:10:36:44 -0700] "GET /lb.html HTTP/1.1" 200 12 "-" "libwww-perl/5.805" 192.168.1.100 - - [13/Jun/2012:10:36:44 -0700] "GET /lb.html HTTP/1.1" 200 12 "-" "libwww-perl/5.805" 192.168.1.100 - - [13/Jun/2012:10:36:44 -0700] "GET /lb.html HTTP/1.1" 200 12 "-" "libwww-perl/5.805" 192.168.1.100 - - [13/Jun/2012:10:36:49 -0700] "GET /lb.html HTTP/1.1" 200 12 "-" "libwww-perl/5.805" 192.168.1.100 - - [13/Jun/2012:10:36:49 -0700] "GET /lb.html HTTP/1.1" 200 12 "-" "libwww-perl/5.805" 192.168.1.100 - - [13/Jun/2012:10:36:49 -0700] "GET /lb.html HTTP/1.1" 200 12 "-" "libwww-perl/5.805" 192.168.1.100 - - [13/Jun/2012:10:36:49 -0700] "GET /lb.html HTTP/1.1" 200 12 "-" "libwww-perl/5.805" 192.168.1.100 - - [13/Jun/2012:10:36:54 -0700] "GET /lb.html HTTP/1.1" 200 12 "-" "libwww-perl/5.805" 192.168.1.100 - - [13/Jun/2012:10:36:54 -0700] "GET /lb.html HTTP/1.1" 200 12 "-" "libwww-perl/5.805" 192.168.1.100 - - [13/Jun/2012:10:36:54 -0700] "GET /lb.html HTTP/1.1" 200 12 "-" "libwww-perl/5.805" 192.168.1.100 - - [13/Jun/2012:10:36:54 -0700] "GET /lb.html HTTP/1.1" 200 12 "-" "libwww-perl/5.805"

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  • VPS hang when one Virtual CPU usage is 100%

    - by garconcn
    We are using Xen Center to manage all of our cPanel VPS servers. The hardware has two CPUs(Intel(R) Xeon(R) CPU [email protected]) and 32GB memory. Each hardware has 4 cPanel VPS and each VPS has 8GB memory and 4 Virtual CPUS. Every one or two months, one of the VPS server will hang because one Virtual CPU usage is 100% and it couldn't release the CPU unless we use force reboot. We have 10 similar hardware, and this cause our server down almost every day. We have tried to avoid the Statistics Processing and Fantastico update during the night, but the problem still happens randomly. I can not find anything in the server log when it hangs. Any clue? Thank you.

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  • Someone try to hack my site, want to understand the log

    - by garconcn
    I have a wordpress site hosted on CentOS 6. After see the following access log, I checked the server, it seems ok. Can anyone explain what does this guy trying to do? Did they get what they want? I have disabled allow_url_include, and restricted open_basedir to web dir and tmp(/etc is not in the path). 190.26.208.130 - - [05/Sep/2012:21:24:42 -0700] "POST http://my_ip/?-d%20allow_url_include%3DOn+-d%20auto_prepend_file%3D../../../../../../../../../../../../etc/passwd%00%20-n/?-d%20allow_url_include%3DOn+-d%20auto_prepend_file%3D../../../../../../../../../../../../etc/passwd%00%20-n HTTP/1.1" 200 32656 "-" "Mozilla/5.0"

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