Discuss March 2012

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217 participants
198 discussions

shellinabox
by Piero 10 Apr '12

10 Apr '12

Hi, is there anyone using shellinabox[1] (Web based AJAX terminal emulator): I'm trying to run it on a Centos 6.2 x86_64 but I cannot past inserting username and I get "session closed". Actually I'm using SELINUX in Enforcing mode but nothing strange is logged in /var/log/audit/audit.log. Actually nothing strange is logged anywhere but I still get only "session closed" after inserting username and pressing enter key. I'm trying to escape a very strong firewall/proxy for the purpose of managing such a Centos box via SSH and, if you know alternatives to shellinabox, I'll be very glad to hear something from you. I already tried corkscrew and tor but both cannot escape firewall/proxy rules. Thanks in advance for your help, Bye Piero [1]http://code.google.com/p/shellinabox/ -- Stupid is as stupid does. Forrest Gump

8 10

Centos6 iptables startup vs. restart?
by Les Mikesell 04 Apr '12

04 Apr '12

What is different about the initial startup of iptables than 'service iptables restart' (and different from C5)? I want to use iptables port redirection to send port 80 to 8080 so a java web service doesn't have to start as root. On C5 it worked to give the iptables commmands, then 'iptables save', and from then on it would automatically work when iptables started after a reboot. With C6, I have the expected entries in /etc/sysconfig/iptables and they are loaded after 'service iptables restart', but the initial startup is doing something else. -- Les Mikesell lesmikesell(a)gmail.com

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centos 6.2 netinstall does not offer "create custom layout" at "Select type of installation " in text mode installation
by Aggelis Aggelis 03 Apr '12

03 Apr '12

I want to install centos 6.2 i386 on a pc with the following specs cpu 1.8 GHz p4 RAM 512 Mbyte HD: IDE 20 GByte i have downloaded netinstall iso and the installer proceeds AUTOMATICALLY in TEXT MODE until the point that i am asked to select the "Type of Installation" where i am presented with the following options ONLY 1) Use all space 2) Replace Existing Linux System 3) Use Free Space the problem is that whatever i choose the installer auto-partitions the hard drive which is something that i do not want. I suspect that due to the low specs of my pc the installer does not enter graphical mode installation which gives the "Create Custom Layout Option" in the "Type of Installation" step. Is this a bug of the installer in text mode and if not is there a workaround in order to be able to create a custom layout ?

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transition to ip6
by Bob Hoffman 03 Apr '12

03 Apr '12

I imagine some day in the near future there will be a switch to ipv6. I cannot imagine ever remembering the ip address then...crazy. My question, since i have never done ip6 stuff, is what does that mean on my webservers? Would I just need to replace my ip4 with ip6 in my eths, bonds, bridges, and configuration files...and copy out my iptables to ip6tables, and change the dns servers? all that does not sound to harsh. anything especially daunting to make that switch (save from someone having to do that on 100 computers really fast!!) -bob

9 31

NFS Hanging Under Heavy Load
by Aaron Blew 02 Apr '12

02 Apr '12

Hello all, I'm currently experiencing an issue with an NFS server I've built (a Dell R710 with a Dell PERC H800/LSI 2108 and four external disk trays). It's a backup target for Solaris 10, CentOS 5.5 and CentOS 6.2 servers that mount it's data volume via NFS. It has two 10gig NICs set up in a layer2+3 bond for one network, and two more 10gig NICs set up in the same way in another network. The host has a 99T XFS filesystem for the backups. RPCNFSDCOUNT is set to 256. During backups from clients the system exhibits odd hangs that interfere with some of our sensitive system's backup windows. On the NFS server side we see the following in dmesg. Originally I thought it was related to dirty writeback cache, but I adjusted dirty_writeback_centisecs and am still seeing the issue. dmesg during the problem window: Mar 16 07:01:21 *****store01 kernel: __ratelimit: 11 callbacks suppressed Mar 16 07:01:21 *****store01 kernel: nfsd: page allocation failure. order:2, mode:0x20 Mar 16 07:01:21 *****store01 kernel: Pid: 6041, comm: nfsd Not tainted 2.6.32-220.4.2.el6.x86_64 #1 Mar 16 07:01:21 *****store01 kernel: Call Trace: Mar 16 07:01:21 *****store01 kernel: <IRQ> [<ffffffff81123daf>] ? __alloc_pages_nodemask+0x77f/0x940 Mar 16 07:01:21 *****store01 kernel: [<ffffffff8115dc62>] ? kmem_getpages+0x62/0x170 Mar 16 07:01:21 *****store01 kernel: [<ffffffff8115e87a>] ? fallback_alloc+0x1ba/0x270 Mar 16 07:01:21 *****store01 kernel: [<ffffffff8115e2cf>] ? cache_grow+0x2cf/0x320 Mar 16 07:01:21 *****store01 kernel: [<ffffffff8115e5f9>] ? ____cache_alloc_node+0x99/0x160 Mar 16 07:01:21 *****store01 kernel: [<ffffffff8142186a>] ? __alloc_skb+0x7a/0x180 Mar 16 07:01:21 *****store01 kernel: [<ffffffff8115f4bf>] ? kmem_cache_alloc_node_notrace+0x6f/0x130 Mar 16 07:01:21 *****store01 kernel: [<ffffffff8115f6fb>] ? __kmalloc_node+0x7b/0x100 Mar 16 07:01:21 *****store01 kernel: [<ffffffff81461e65>] ? ip_rcv+0x275/0x350 Mar 16 07:01:21 *****store01 kernel: [<ffffffff8142186a>] ? __alloc_skb+0x7a/0x180 Mar 16 07:01:21 *****store01 kernel: [<ffffffff814219e6>] ? __netdev_alloc_skb+0x36/0x60 Mar 16 07:01:21 *****store01 kernel: [<ffffffffa0188104>] ? ixgbe_alloc_rx_buffers+0x2c4/0x380 [ixgbe] Mar 16 07:01:21 *****store01 kernel: [<ffffffff8127f980>] ? swiotlb_map_page+0x0/0x100 Mar 16 07:01:21 *****store01 kernel: [<ffffffffa0189158>] ? ixgbe_clean_rx_irq+0x818/0x8b0 [ixgbe] Mar 16 07:01:21 *****store01 kernel: [<ffffffffa01895ff>] ? ixgbe_clean_rxtx_many+0x10f/0x220 [ixgbe] Mar 16 07:01:21 *****store01 kernel: [<ffffffff814307c3>] ? net_rx_action+0x103/0x2f0 Mar 16 07:01:21 *****store01 kernel: [<ffffffff81072001>] ? __do_softirq+0xc1/0x1d0 Mar 16 07:01:21 *****store01 kernel: [<ffffffff810d9390>] ? handle_IRQ_event+0x60/0x170 Mar 16 07:01:21 *****store01 kernel: [<ffffffff8107205a>] ? __do_softirq+0x11a/0x1d0 Mar 16 07:01:21 *****store01 kernel: [<ffffffff8100c24c>] ? call_softirq+0x1c/0x30 Mar 16 07:01:21 *****store01 kernel: [<ffffffff8100de85>] ? do_softirq+0x65/0xa0 Mar 16 07:01:21 *****store01 kernel: [<ffffffff81071de5>] ? irq_exit+0x85/0x90 Mar 16 07:01:21 *****store01 kernel: [<ffffffff814f4c85>] ? do_IRQ+0x75/0xf0 Mar 16 07:01:21 *****store01 kernel: [<ffffffff8100ba53>] ? ret_from_intr+0x0/0x11 Mar 16 07:01:21 *****store01 kernel: <EOI> [<ffffffff8105673f>] ? finish_task_switch+0x4f/0xe0 Mar 16 07:01:21 *****store01 kernel: [<ffffffff814ec9ce>] ? thread_return+0x4e/0x760 Mar 16 07:01:21 *****store01 kernel: [<ffffffff81123741>] ? __alloc_pages_nodemask+0x111/0x940 Mar 16 07:01:21 *****store01 kernel: [<ffffffff814ed7b2>] ? schedule_timeout+0x192/0x2e0 Mar 16 07:01:21 *****store01 kernel: [<ffffffff8107c0a0>] ? process_timeout+0x0/0x10 Mar 16 07:01:21 *****store01 kernel: [<ffffffffa0319415>] ? svc_recv+0x5a5/0x850 [sunrpc] Mar 16 07:01:21 *****store01 kernel: [<ffffffff8105e7f0>] ? default_wake_function+0x0/0x20 Mar 16 07:01:21 *****store01 kernel: [<ffffffffa03fcb45>] ? nfsd+0xa5/0x160 [nfsd] Mar 16 07:01:21 *****store01 kernel: [<ffffffffa03fcaa0>] ? nfsd+0x0/0x160 [nfsd] Mar 16 07:01:21 *****store01 kernel: [<ffffffff81090726>] ? kthread+0x96/0xa0 Mar 16 07:01:21 *****store01 kernel: [<ffffffff8100c14a>] ? child_rip+0xa/0x20 Mar 16 07:01:21 *****store01 kernel: [<ffffffff81090690>] ? kthread+0x0/0xa0 Mar 16 07:01:21 *****store01 kernel: [<ffffffff8100c140>] ? child_rip+0x0/0x20 xfs_info: # xfs_info /data meta-data=/dev/sdb1 isize=256 agcount=99, agsize=268435200 blks = sectsz=512 attr=2 data = bsize=4096 blocks=26367491584, imaxpct=1 = sunit=256 swidth=9216 blks naming =version 2 bsize=4096 ascii-ci=0 log =internal bsize=4096 blocks=521728, version=2 = sectsz=512 sunit=8 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 cat /etc/centos-release: CentOS release 6.2 (Final) uname -a: Linux *****store01 2.6.32-220.4.2.el6.x86_64 #1 SMP Tue Feb 14 04:00:16 GMT 2012 x86_64 x86_64 x86_64 GNU/Linux lspci output: 00:00.0 Host bridge: Intel Corporation 5520 I/O Hub to ESI Port (rev 13) 00:01.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI Express Root Port 1 (rev 13) 00:03.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI Express Root Port 3 (rev 13) 00:04.0 PCI bridge: Intel Corporation 5520/X58 I/O Hub PCI Express Root Port 4 (rev 13) 00:05.0 PCI bridge: Intel Corporation 5520/X58 I/O Hub PCI Express Root Port 5 (rev 13) 00:06.0 PCI bridge: Intel Corporation 5520/X58 I/O Hub PCI Express Root Port 6 (rev 13) 00:07.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI Express Root Port 7 (rev 13) 00:09.0 PCI bridge: Intel Corporation 5520/5500/X58 I/O Hub PCI Express Root Port 9 (rev 13) 00:14.0 PIC: Intel Corporation 5520/5500/X58 I/O Hub System Management Registers (rev 13) 00:14.1 PIC: Intel Corporation 5520/5500/X58 I/O Hub GPIO and Scratch Pad Registers (rev 13) 00:14.2 PIC: Intel Corporation 5520/5500/X58 I/O Hub Control Status and RAS Registers (rev 13) 00:1a.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 02) 00:1a.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 02) 00:1a.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 02) 00:1d.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 02) 00:1d.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 02) 00:1d.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 02) 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 92) 00:1f.0 ISA bridge: Intel Corporation 82801IB (ICH9) LPC Interface Controller (rev 02) 00:1f.2 IDE interface: Intel Corporation 82801IB (ICH9) 2 port SATA Controller [IDE mode] (rev 02) 01:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet (rev 20) 01:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet (rev 20) 02:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet (rev 20) 02:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet (rev 20) 03:00.0 SCSI storage controller: LSI Logic / Symbios Logic SAS1068E PCI-Express Fusion-MPT SAS (rev 08) 04:00.0 Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection (rev 01) 04:00.1 Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection (rev 01) 05:00.0 Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection (rev 01) 05:00.1 Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection (rev 01) 06:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS 2108 [Liberator] (rev 05) 08:03.0 VGA compatible controller: Matrox Graphics, Inc. MGA G200eW WPCM450 (rev 0a) /etc/sysctl.conf changes: net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.ipv4.tcp_rmem = 4096 2621440 16777216 net.ipv4.tcp_wmem = 4096 2621440 16777216 net.core.netdev_max_backlog = 250000 net.ipv4.route.flush = 1 net.ipv4.tcp_window_scaling = 1 vm.dirty_writeback_centisecs = 50 Has anyone else seem similar issues? I can provide additional details about the server/configuration if anybody needs anything else. The issue only seems to occur under high write load as we've restored some of these backups and didn't seem to have an issue reading the data. Thanks all, -Aaron

2 4

Grails 1.3.x (S)RPM for CentOS 6?
by Patrick Lists 02 Apr '12

02 Apr '12

Hi, My Google foo came up empty. Does anyone know where I can find a Grails 1.3.x (S)RPM? Thanks! Patrick

2 2

Postfix problems with maximum messages size
by James B. Byrne 01 Apr '12

01 Apr '12

CentOS-6.2 I am confused. I need to accept messages somewhat larger than the default 10M allowed by Postfix. However, changing the message_size_limit in /etc/postfix/main.cf is having no effect. Squirrelmail is configured to accept and transmit messages up to 24M and this identical configuration is working on a Sendmail installation. So the problem appears to me to be strictly at Postfix matter. # grep message_size_limit /etc/postfix/* /etc/postfix/main.cf:message_size_limit = 20480000 # postfix reload postfix/postfix-script: refreshing the Postfix mail system # postconf -n | grep size_limit message_size_limit = 20480000 smtp message generated to squirrelmail client Message not sent. Server replied: Requested mail action aborted: exceeding storage allocation 552 5.2.3 Message exceeds maximum fixed size (12000000) What is going on? Why am I unable to have configured limit of 20M take effect? -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

3 2

SMTP Port 465 - Postfix
by Prabhpal S. Mavi 31 Mar '12

31 Mar '12

Greetings Dear Friends ! i have Postfix Running On CentOS 6.2 x86_64, TLS/SASL is already configured and working. Can anyone please assist me how to configure Postfix to listen and accept TLS connections on smtp:465? Thanks / Regards Prabhpal S. Mavi

7 14

nfslock
by m.roth＠5-cent.us 31 Mar '12

31 Mar '12

I just updated one of our servers to 5.8, and rebooted. In the logs, I saw a bunch of Mar 21 16:29:02 <server> rpc.statd[9783]: recv_rply: can't decode RPC message! Mar 21 16:29:33 <server> last message repeated 442 times Mar 21 16:30:34 <server> last message repeated 835 times Mar 21 16:31:36 <server> last message repeated 884 times Mar 21 16:32:38 <server> last message repeated 856 times Mar 21 16:32:44 <server> last message repeated 111 times I tried restarting nfslock, and that *appears* to have fixed it. Googling, I found a thread about that at <http://nerdbynature.de/s9y/archives/2009/08.html>, which suggests that it's starting too early, possibly before portmap is running. Anyone else see this? Has an old bug snuck back in? mark

10 18

About Postfix mail server using dovecot and courier imap configuration
by jiten jha 31 Mar '12

31 Mar '12

Dear Friends, I am new in server side so i want to configure new Postfix mail server using dovecot or courier imap configuration . But I want courier for configure server . I do not want any database for store mails and users information. It just like create users then all mail goes to users home folder. Like useradd /home/jiten/ then all mail store in my jiten folders. Please help me it is urgent for me. -- Regards Jitendra Jha

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Discuss March 2012