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• Page allocation failures on iSCSI storage

  - by Dave

  We have a CentOS 6.3 iscsi server (16GB RAM) running on Infiniband bus (ipoib). When the load is high I can see multiple errors: Sep 3 23:22:20 stor4 kernel: tgtd: page allocation failure. order:2, mode:0x20 Sep 3 23:22:20 stor4 kernel: Pid: 3637, comm: tgtd Not tainted 2.6.32 #1 Sep 3 23:22:20 stor4 kernel: Call Trace: Sep 3 23:22:20 stor4 kernel: [] ? __alloc_pages_nodemask+0x77f/0x940 Sep 3 23:22:20 stor4 kernel: [] ? kmem_getpages+0x62/0x170 Sep 3 23:22:20 stor4 kernel: [] ? fallback_alloc+0x1ba/0x270 Sep 3 23:22:20 stor4 kernel: [] ? cache_grow+0x2cf/0x320 Sep 3 23:22:20 stor4 kernel: [] ? ____cache_alloc_node+0x99/0x160 Sep 3 23:22:20 stor4 kernel: [] ? pskb_expand_head+0x64/0x270 Sep 3 23:22:20 stor4 kernel: [] ? __kmalloc+0x189/0x220 Sep 3 23:22:20 stor4 kernel: [] ? pskb_expand_head+0x64/0x270 Sep 3 23:22:20 stor4 kernel: [] ? __pskb_pull_tail+0x2aa/0x360 Sep 3 23:22:20 stor4 kernel: [] ? tcp_init_tso_segs+0x37/0x50 Sep 3 23:22:20 stor4 kernel: [] ? dev_queue_xmit+0x4bb/0x6f0 Sep 3 23:22:20 stor4 kernel: [] ? neigh_connected_output+0xbd/0x100 Sep 3 23:22:20 stor4 kernel: [] ? ip_finish_output+0x237/0x310 Sep 3 23:22:20 stor4 kernel: [] ? ip_output+0xb8/0xc0 Sep 3 23:22:20 stor4 kernel: [] ? __ip_local_out+0x9f/0xb0 Sep 3 23:22:20 stor4 kernel: [] ? ip_local_out+0x25/0x30 Sep 3 23:22:20 stor4 kernel: [] ? ip_queue_xmit+0x190/0x420 Sep 3 23:22:20 stor4 kernel: [] ? sock_aio_write+0x167/0x180 Sep 3 23:22:20 stor4 kernel: [] ? tcp_transmit_skb+0x3fe/0x7b0 Sep 3 23:22:20 stor4 kernel: [] ? tcp_write_xmit+0x1fb/0xa20 Sep 3 23:22:20 stor4 kernel: [] ? __tcp_push_pending_frames+0x30/0xe0 Sep 3 23:22:20 stor4 kernel: [] ? tcp_push_pending_frames+0x33/0x40 Sep 3 23:22:20 stor4 kernel: [] ? do_tcp_setsockopt+0x3d6/0x480 Sep 3 23:22:20 stor4 kernel: [] ? tcp_setsockopt+0x2a/0x30 Sep 3 23:22:20 stor4 kernel: [] ? sock_common_setsockopt+0x14/0x20 Sep 3 23:22:20 stor4 kernel: [] ? sys_setsockopt+0x7f/0xe0 Sep 3 23:22:20 stor4 kernel: [] ? system_call_fastpath+0x16/0x1b Sep 3 23:22:20 stor4 kernel: Mem-Info: Sep 3 23:22:20 stor4 kernel: Node 0 DMA per-cpu: Sep 3 23:22:20 stor4 kernel: CPU 0: hi: 0, btch: 1 usd: 0 Sep 3 23:22:20 stor4 kernel: CPU 1: hi: 0, btch: 1 usd: 0 Sep 3 23:22:20 stor4 kernel: CPU 2: hi: 0, btch: 1 usd: 0 Sep 3 23:22:20 stor4 kernel: CPU 3: hi: 0, btch: 1 usd: 0 Sep 3 23:22:20 stor4 kernel: Node 0 DMA32 per-cpu: Sep 3 23:22:20 stor4 kernel: CPU 0: hi: 186, btch: 31 usd: 183 Sep 3 23:22:20 stor4 kernel: CPU 1: hi: 186, btch: 31 usd: 23 Sep 3 23:22:20 stor4 kernel: CPU 2: hi: 186, btch: 31 usd: 183 Sep 3 23:22:20 stor4 kernel: CPU 3: hi: 186, btch: 31 usd: 181 Sep 3 23:22:20 stor4 kernel: Node 0 Normal per-cpu: Sep 3 23:22:20 stor4 kernel: CPU 0: hi: 186, btch: 31 usd: 171 Sep 3 23:22:20 stor4 kernel: CPU 1: hi: 186, btch: 31 usd: 29 Sep 3 23:22:20 stor4 kernel: CPU 2: hi: 186, btch: 31 usd: 32 Sep 3 23:22:20 stor4 kernel: CPU 3: hi: 186, btch: 31 usd: 32 Sep 3 23:22:20 stor4 kernel: active_anon:1875 inactive_anon:2473 isolated_anon:0 Sep 3 23:22:20 stor4 kernel: active_file:1243637 inactive_file:2505055 isolated_file:0 Sep 3 23:22:20 stor4 kernel: unevictable:0 dirty:268338 writeback:0 unstable:0 Sep 3 23:22:20 stor4 kernel: free:86050 slab_reclaimable:132377 slab_unreclaimable:23744 Sep 3 23:22:20 stor4 kernel: mapped:1293 shmem:222 pagetables:720 bounce:0 Sep 3 23:22:20 stor4 kernel: Node 0 DMA free:15732kB min:124kB low:152kB high:184kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15332kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes Sep 3 23:22:20 stor4 kernel: lowmem_reserve[]: 0 2172 16060 16060 Sep 3 23:22:20 stor4 kernel: Node 0 DMA32 free:107544kB min:18268kB low:22832kB high:27400kB active_anon:468kB inactive_anon:2364kB active_file:566208kB inactive_file:976112kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:2224900kB mlocked:0kB dirty:96816kB writeback:0kB mapped:908kB shmem:12kB slab_reclaimable:176940kB slab_unreclaimable:968kB kernel_stack:64kB pagetables:192kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no Sep 3 23:22:20 stor4 kernel: lowmem_reserve[]: 0 0 13887 13887 Sep 3 23:22:20 stor4 kernel: Node 0 Normal free:220924kB min:116772kB low:145964kB high:175156kB active_anon:7032kB inactive_anon:7528kB active_file:4408340kB inactive_file:9044108kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:14220800kB mlocked:0kB dirty:976536kB writeback:0kB mapped:4264kB shmem:876kB slab_reclaimable:352568kB slab_unreclaimable:94008kB kernel_stack:2048kB pagetables:2688kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no Sep 3 23:22:20 stor4 kernel: lowmem_reserve[]: 0 0 0 0 Sep 3 23:22:20 stor4 kernel: Node 0 DMA: 1*4kB 0*8kB 1*16kB 1*32kB 1*64kB 0*128kB 1*256kB 0*512kB 1*1024kB 1*2048kB 3*4096kB = 15732kB Sep 3 23:22:20 stor4 kernel: Node 0 DMA32: 16305*4kB 4381*8kB 353*16kB 8*32kB 1*64kB 1*128kB 0*256kB 1*512kB 1*1024kB 0*2048kB 0*4096kB = 107900kB Sep 3 23:22:20 stor4 kernel: Node 0 Normal: 14548*4kB 14808*8kB 2420*16kB 31*32kB 5*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 1*4096kB = 220784kB Sep 3 23:22:20 stor4 kernel: 3748822 total pagecache pages Sep 3 23:22:20 stor4 kernel: 0 pages in swap cache Sep 3 23:22:20 stor4 kernel: Swap cache stats: add 0, delete 0, find 0/0 Sep 3 23:22:20 stor4 kernel: Free swap = 975864kB Sep 3 23:22:20 stor4 kernel: Total swap = 975864kB Sep 3 23:22:20 stor4 kernel: 4194303 pages RAM Sep 3 23:22:20 stor4 kernel: 126915 pages reserved Sep 3 23:22:20 stor4 kernel: 3753534 pages shared Sep 3 23:22:20 stor4 kernel: 213500 pages non-shared TCP stack and VM config: net.core.rmem_max = 83886080 net.core.wmem_max = 83886080 net.core.rmem_default = 65536 net.core.wmem_default = 65536 net.ipv4.tcp_rmem = 40960 1048560 4194304 net.ipv4.tcp_wmem = 40960 196608 4194304 net.ipv4.tcp_mem = 16388608 16388608 16388608 vm.min_free_kbytes=135168 Additional tweaks: /sbin/blockdev --setra 16384 /dev/sdb echo 2048 /sys/block/sdb/queue/nr_requests Where might the problem be? Thank you.

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• Why grep -i is so slow? How to do it faster for ASCII?

  - by Vi.

  $ time lzop -d < tvtropes-index.lzo | egrep -B 5 '[Dd][eE][sS][cC][eE][nN][dD] ?[Ff][rR][oO][mM]' real 0m0.438s $ time lzop -d < tvtropes-index.lzo | egrep -B 5 'descend ?from' -i real 0m11.294s Both search insensitively. why -i so slow? How to make fast grep -i without entering things [iI][nN] [tT][hH][iI][sS] [wW][aA][Yy]? For example, perl -ne 'print if /descend ?from/i' works fast, but '-B 5' is not as trivial to implement as in grep (as well as other options).

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• I don't see the running guest in virsh

  - by Louise Hoffman

  Using CentOS 5 with KVM. I have downloaded this KVM applicance, and when unzipped it is just a .img file. No xml file supplied. I can start the guest with /usr/libexec/qemu-kvm -hda /data/kvm/slash.img -m 512 and it works. Now I would like to make a config file for the guest. The problem is when I do # virsh -c qemu:///system list Id Name State ---------------------------------- # I don't see the guest as expected. Does anyone know what is wrong?

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• How can I make subversion reset the stored passwords/users and remember my authentication credential

  - by NicDumZ

  Hello folks! Background: I used to have everything working just fine on my fresh install: $ svn co https://domain:443/ test1 Error validating server certificate for 'https://domain:443': - The certificate is not issued by a trusted authority. Use the fingerprint to validate the certificate manually! Certificate information: - Hostname: **REMOVED** - Valid: **REMOVED** - Issuer: **REMOVED** - Fingerprint: **checked with issuer and REMOVED** (R)eject, accept (t)emporarily or accept (p)ermanently? p Authentication realm: <https://domain:443> Subversion repository Password for 'nicdumz-machine-hostname': Authentication realm: <https://domain:443> Subversion repository Username: nicdumz Password for 'nicdumz': # proceeds to checkout correctly $ svn co https://domain:443/ test2 # checkouts nicely, without asking for my password. At some point I needed to commit stuff using a different account. So I did that $ svn ci --username other.user Authentication realm: <https://domain:443> Subversion repository Password for 'other.user': # works fine But since then, everytime I want to commit as 'nicdumz' (default user, all repos have been checked-out with that user), it prompts me for my password: $ svn ci Authentication realm: <https://domain:443> Subversion repository Password for 'nicdumz': Hey come on, why :) The same happens if I want a fresh checkout, since read-access is also protected. So I tried fixing the issue by myself. I read around that ~/.subversion/auth was storing credentials, so I removed it from the way: $ cd ~/.subversion $ mv auth oldauth $ mkdir auth It seemed to work at first, because svn had forgotten about certificate validation: $ svn co https://domain:443/ test3 Error validating server certificate for 'https://domain:443': - The certificate is not issued by a trusted authority. Use the fingerprint to validate the certificate manually! Certificate information: - Hostname: **REMOVED** - Valid: **REMOVED** - Issuer: **REMOVED** - Fingerprint: **checked with issuer and REMOVED** (R)eject, accept (t)emporarily or accept (p)ermanently? p Authentication realm: <https://domain:443> Subversion repository Password for 'nicdumz-machine-hostname': Authentication realm: <https://domain:443> Subversion repository Username: nicdumz Password for 'nicdumz': # proceeds to checkout correctly $ svn up Authentication realm: <https://domain:443> Subversion repository Password for 'nicdumz': What? how is this happening? If you have suggestions to investigate more about the behaviour, I am very interested. If I'm correct, there is no way to do a verbose svn up or anything of the like, so I'm not sure should I go for investigation. Oh, and for what it's worth: $ svn --version svn, version 1.6.6 (r40053) compiled Oct 26 2009, 06:19:08 Copyright (C) 2000-2009 CollabNet. Subversion is open source software, see http://subversion.tigris.org/ This product includes software developed by CollabNet (http://www.Collab.Net/). The following repository access (RA) modules are available: * ra_neon : Module for accessing a repository via WebDAV protocol using Neon. - handles 'http' scheme - handles 'https' scheme * ra_svn : Module for accessing a repository using the svn network protocol. - with Cyrus SASL authentication - handles 'svn' scheme * ra_local : Module for accessing a repository on local disk. - handles 'file' scheme * ra_serf : Module for accessing a repository via WebDAV protocol using serf. - handles 'http' scheme - handles 'https' scheme

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• Mounting /var /tmp /var/log to separate partition

  - by William MacDonald

  Per DISA hardening requirements for RHEL, I'm supposed to make sure a number of locations on the filesystem are mounted on separate partitions. A few of the locations they specify include /var /tpm /var/log etc. Is it possible to go about doing this on a live machine (without booting a separate OS)? And how would I go about doing that. I've backed up the OS so if I do screw something up I can recover. Thanks!

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• Apache returning text/html on some png files

  - by Oren

  I have an Apache web server that has a sub folder for images. For some reason, a few of the .png files are returned as text/html and not as image/png. There is nothing indicating a permission problem and the files return with code 200 and with full size. I made sure that image/png is set and even tried forcing it with .htaccess Any idea where to look next? Edit: looks like an .htaccess configuration problem on a parent directory.

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• how to customize debian installation cd for your needs

  - by Frank

  I have with me a Debian CD, which I want to customize for my own needs. I have extracted the CD and started to change some parts of it, e.g Splash screen (splash.png) installer Title (through isolinux.cfg) etc These are the things that I want to do: Change the Splash logo at start up of installation to have my own (which is done) Change the grub boot parameters to use my comapny name on it. Change the set of packages in it, so that I can have my own set of packages in it and only those packages are installed Do some post installation steps Customize it's startup and login screen to have my company name. After I am done with this customization, I need to build its live installer CD so that I can install it on my own, on any other system.

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• Poor write performance on Debian server running NFS with 22TB exported JFS filesystem

  - by user143546

  I am currently running a debian server that is exporting a large JFS filesystem (22TB) over NFS (nfs-kernel-server.) When attempting to write to the NFS share, the performance is very poor. The 22TB disk is sitting on a NAS mounted using iSCSI. It will bust for a moment near expected line speed, and then sit idle for several seconds. Very little traffic measured in the low kb/sec. The wait peeks on write. When reading from the NFS mount, the system operates at expected speeds (11MB/sec). The issue does not occur when using SFTP, rsync, or local coping (non-nfs). The issue persists between stable and testing releases. On the same machine I have a 14TB ext4 filesystem using the exact same export configuration that does not share the issue. This share is not in regular use and thus not consuming resources. NFS Server: cat /etc/exports /data2 10.1.20.86(rw,no_subtree_check,async,all_squash) cat /sys/block/sdb/queue/scheduler noop [deadline] cfq cat /etc/default/nfs-kernel-server RPCNFSDCOUNT=8 RPCNFSDPRIORITY=0 RPCMOUNTDOPTS=--manage-gids NEED_SVCGSSD= RPCSVCGSSDOPTS= NFS Client: cat /etc/fstab 10.1.20.100:/data2 /root/incoming nfs rw,noatime,soft,intr,noacl 0 2 cat /sys/block/sdb/queue/scheduler noop [deadline] cfq cat /proc/mounts 10.1.20.100:/data2/ /root/incoming nfs4 rw,noatime,vers=4,rsize=262144,wsize=262144,namlen=255,soft,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=10.1.20.86,minorversion=0,addr=10.1.20.100 0 0 This problem has me pretty stumped. Any help would be greatly welcomed. Thanks.

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• SSH reverse tunnel to monitor and manage remote devices

  - by acid_crucifix

  I have a set a distributed set of devices running Ubuntu 12.04 that I am distributing to clients. I would like to manage them remotely. They may not have fixed IPs and potentially might be behind firewalls. What I am planning to do is have the devices (permanently connected to the net) poll a request URL and based on the response open a reverse tunnel to my server, so that I can access them via that tunnel. Most of what I read about reverse tunnel over SSH is for single use cases and very little about heavy production usage. Is there some reason for this, security issues? or stability? Any help would be much obliged.

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• How to force rsync to use destination directory as root

  - by thepurplepixel

  I have a simple script to one-way-sync files/folders within a directory: #!/bin/bash HOST='<hostname>' USER='<username>' DIR='/downloads/' SOURCE='/srv/torrents' rsync -e "ssh -l $USER" --remove-source-files -h -4 -r --stats --progress -i $SOURCE $HOST:$DIR find $SOURCE -type d -empty -prune -exec rmdir -p \{\} \; However, when this rsync operation runs, it creates a folder, torrents in /downloads on the destination machine. How can I force rsync to put all folders & files from /srv/torrents (remote) into /downloads/ (local) instead of creating /downloads/torrents as a separate directory?

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• [Ubuntu] Can't change permission for bash.bashrc file

  - by user20285

  I tried following the example from here (http://catcode.com/teachmod/chmod_cmd2.html): Open up publicity.html for reading and writing by anyone. Before: -rw-r--r-- publicity.html Command: chmod og=rw publicity.html After: -rw-rw-rw- publicity.html Here's my terminal session: username@ubuntu:/etc$ -rw-r--r-- bash.bashrc -rw-r--r--: command not found username@ubuntu:/etc$ chmod og=rw bash.bashrc chmod: changing permissions of `bash.bashrc': Operation not permitted username@ubuntu:/etc$ -rw-rw-rw- bash.bashrc -rw-rw-rw-: command not found

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• mongod fork vs nohup

  - by Daniel Kitachewsky

  I'm currently writing process management software. One package we use is mongo. Is there any difference between launching mongo with mongod --fork --logpath=/my/path/mongo.log and nohup mongod >> /my/path/mongo.log 2>&1 < /dev/null & ? My first thought was that --fork could spawn more processes and/or threads, and I was suggested that --fork could be useful for changing the effective user (downgrading privileges). But we run all under the same user (process manager and mongod), so is there any other difference? Thank you

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• Iptables ignoring a rule in the config file

  - by Overdeath

  I see lot of established connections to my apache server from the ip 188.241.114.22 which eventually causes apache to hang . After I restart the service everything works fine. I tried adding a rule in iptables -A INPUT -s 188.241.114.22 -j DROP but despite that I keep seeing connections from that IP. I'm using centOS and i'm adding the rule like thie: iptables -A INPUT -s 188.241.114.22 -j DROP Right afther that I save it using: service iptables save Here is the output of iptables -L -v ` Chain INPUT (policy ACCEPT 120K packets, 16M bytes) pkts bytes target prot opt in out source destination 0 0 DROP all -- any any lg01.mia02.pccwbtn.net anywhere 0 0 DROP all -- any any c-98-210-5-174.hsd1.ca.comcast.net anywhere 0 0 DROP all -- any any c-98-201-5-174.hsd1.tx.comcast.net anywhere 0 0 DROP all -- any any lg01.mia02.pccwbtn.net anywhere 0 0 DROP all -- any any www.dabacus2.com anywhere 0 0 DROP all -- any any 116.255.163.100 anywhere 0 0 DROP all -- any any 94.23.119.11 anywhere 0 0 DROP all -- any any 164.bajanet.mx anywhere 0 0 DROP all -- any any 173-203-71-136.static.cloud-ips.com anywhere 0 0 DROP all -- any any v1.oxygen.ro anywhere 0 0 DROP all -- any any 74.122.177.12 anywhere 0 0 DROP all -- any any 58.83.227.150 anywhere 0 0 DROP all -- any any v1.oxygen.ro anywhere 0 0 DROP all -- any any v1.oxygen.ro anywhere Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 186K packets, 224M bytes) pkts bytes target prot opt in out source destination `

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• s3fs changing s3 permissions?

  - by magd1

  My developer believes that s3fs is changing my bucket's permissions. Is this possible? I want my bucket to be public, but it keeps reverting back to private. Here's my fstab. s3fs#production /mnt/production fuse use_cache=/tmp,use_rrs=1,allow_other,uid=1000,gid=1000 0 0 My developer mentioned the "-o default_acl (default="private")" option. The documentation refers to "canned acl", but I don't understand what these are.

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• How can I optimize ubuntu desktop to run my webserver

  - by Parry

  Hi, I am using ubuntu desktop edition to run My drupal website on Intranet. I know for running web servers best thing to install is ubuntu server editions, but due to some problem i am using Desktop edition. I installed XAMPP on my machine an my website is up and running. I want to know how can i optimize my machine?? Since I will not use very less features of desktop editions are there any things which I can remove or stop which will free memory and cpu consumption, are there any packages which i should install to increase the performance of my ubuntu??

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• .htaccess modify rules and redirect if there's .php in the url

  - by Ron

  Hello everyone. I got the following code in my .htaccess: Options +FollowSymlinks RewriteBase /temp/test/ RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME}\.php -f RewriteRule ^about/(.*)/$ $1.php [L] RewriteRule ^(.*)/download/(.*)/(.*)/(.*)/downloadfile/$ file-download.php?product=$1&version=$2&os=$3&method=$4 [L] RewriteRule ^(.*)/download/(.*)/(.*)/(.*)/$ download-donate.php?product=$1&version=$2&os=$3&method=$4 [L] RewriteRule ^(.*)/download/(.*)/$ download.php?product=$1&version=$2 [L] RewriteRule ^newsletter-confirm/(.*)/$ newsletter-confirm.php?email=$1 [L] RewriteRule ^newsletter-remove/(.*)/$ newsletter-remove.php?email=$1 [L] RewriteRule ^(.*)/screenshots/$ screenshots.php?product=$1 [L] RewriteRule ^(.*)/(.*)/$ products.php?product=$1&page=$2 [L] RewriteRule ^schedule-manager/$ products.php?product=schedule-manager&page=view [L] RewriteRule ^visual-command-line/$ products.php?product=visual-command-line&page=view [L] RewriteRule ^windows-hider/$ products.php?product=windows-hider&page=view [L] RewriteRule ^(.*)/$ $1.php [L] RewriteRule ^products/$ products.php [L] everything work perfect. I would like to know how can I modify it so it will be less lines. I am pretty sure I can atleast remove 4-5 lines, but I dont know how. (merge the schedule-manager, visual-command-line and windows-hider, and some more). I know that the order of the rules is important, this order works - although I have no idea why, I just played with the rules until it worked. If you think that there'll be a bug with the following order please tell me where. Another thing - I would like to redirect for example www.myweb.com/products.php to www.myweb.com/products/ (I mean that the URL in the address bar will change). I dont know if the redirect can go along with my rewrite rules. Thank you.

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• Extract part of a image from a big image

  - by rajat

  I have a 6 images , and each image has a certain section that i want to save as a separate image , the problem is that it has to be accurate because i am doing some animation using the sub-image so they should exactly . so I want to accurately extract a that part from each of the 6 images , i can't do it using a image editor in which i have to make the bounding box myself because it will not be accurate , is there any program that lets me do this by like defining a box using numerical values. PS: I don't want to write matlab or opencv program for this .

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• Limit PulseAudio volume to prevent overdrive

  - by el.pescado

  Is it possible to limit maximum volume in PulseAudio? Currently, PulseAudio sets PCM channel too loud which results in distorted sound. I use aumix to turn volume down, but whenever any other sound is played (IM notification etc), PA plays with knobs, turning master volume down and PCM up. aumix ++++++++++++++++++++O+++++<Vol ++++++++++++++++++++O+++++ Pcm ++++++++++++O+++++++++++++ becomes: aumix ++++++++++++++++O+++++++++<Vol ++++++++++++++++++++++++O+ Pcm ++++++++++++O+++++++++++++ I use OpenSUSE 11.2, pulseaudio 0.9.21, ALSA 1.0.21 and ALC889A sound codec.

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• What are the minimum required modules to run WordPress

  - by Mister IT Guru

  Recently a 'consultant' came in to talk to bean counters at my place of employment, with regards to being more efficient with our IT infrastructure. They suggested to be more efficient we should only load the Apache modules that are required on our web servers. (This is just 1 of 1Ks of suggestions). The Bean Counters are very excited, and prepared for me to spend the time to investigate this avenue of cost cutting. I don't mind this mundane exercise, I see it as a learning experience! I guess this leads me to the actual question: How can I determine the minimum required apache modules for a PHP based application without actually going through the code, or plain old trial and error?

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• Understanding connection tracking in iptables

  - by Matt

  I'm after some clarification of the state/connection tracking in iptables. What is the difference between these rules? iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT Is connection tracking turned on when a packet is first matched containing -m state --state BLA , or is connection tracking always on? Can/Should connection state be used for fast matching like below? e.g. suppose this is some sort of router/firewall (no nat). # Default DROP policy iptables -P INPUT DROP iptables -P OUTPUT DROP iptables -P FORWARD DROP # Drop invalid iptables -A FORWARD -m state --state INVALID -j DROP # Accept established,related connections iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT # Allow ssh through, track connection iptables -A FORWARD -p tcp --syn --dport 22 -m state --state NEW -j ACCEPT

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• Rsync and Lazy mode ?

  - by fabien-barbier

  Since transferring or copying a file that is being used sometimes causes corruption of the transferred file, can we define a time interval in which Rsync checks each file in a given directory to see if there is a change within that time interval ? Files that are not changed during that interval will be transferred, while those that have changes will not. Can I do that with rsync ? Or another tool ? Is there a script to add this functionality to Rsync ? Thanks

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• rsync remote to local automatic backup

  - by Mark Molina

  Because all my work is stored on a remote server I would like to auto backup my server monthly and weekly. My server is running Centos 5.5 and while searching the web I'm found a tool named rsync. I got my first update manually by using this command in terminal: sudo rsync -chavzP --stats USERNAME@IPADDRES: PATH_TO_BACKUP LOCAL_PATH_TO_BACKUP I then prompt my password for that user and bob's my uncle. This backups the necessary files from my remote server to my local device but does somebody know how I can automate this? Like automatic running this script every sunday? EDIT I forgot to mention that I let direct admin backup the files I need and then copy those files from the remote server to a local server.

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• How to bulk-rename files with invalid encoding or bulk-replace invalid encoded characters?

  - by qdoe

  I have a debian server and I'm hosting music for an internet radio station. I have trouble with file names and paths because a lot of files got an invalid encoding, for example: ./music/Bändname - Some Title - additional Info/B?ndname - 07 - This Title Is Cörtain, The EncÃ?ding Not.mp3 Ideally, I would like to remove everything that is not letters A-Z/a-z or numbers 0-9 or dash -/underscore _... The result should look like something like that: ./music/Bndname-SomeTitle-additionalInfo/Bndname-07-ThisTitleIsCrtain,TheEnc?dingNot.mp3 How to achieve this for a batch of a lot of files and directories? I've seen this similar question: bulk rename (or correctly display) files with special characters But this only fixes the encoding, I would prefer a more strict approach as described above.

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• dns ptr entry table

  - by mhay

  what file shall touch to update ptr entry table ? thanks

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• gpasswd and access to a file or directory

  - by PeanutsMonkey

  As I understand it if I run the command gpasswd -A username directoryname I assign administrator privileges to username for the directory directoryname. This means that username is able to add new members to the group for directoryname without root privileges. Does this also mean that username belongs to the group or do I need to add username to the group using the commands usermod, gpasswd -a or gpasswd -M

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