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  • What's going on with my server? High load, lots of idle CPU time, low disk utilization

    - by Jonathan
    I run a web site and send a legitimate opt-in, daily email newsletter to subscribers. Both the web hosting and email sending are done by the same machine. I have about 100,000 subscribers who have opted in to my daily email newsletter. My PHP script did a pretty good job sending mail to all of them until fairly recently, but as the list has grown I can't keep up. When I run top, I have very high load--usually at least 6 or 7, sometimes as high as 15--even though I only have two CPUs. However, when I run sar, my CPU is idle an average of about 30% of the time. So, it seems I'm not CPU bound. When I run iostat, it seems as though I'm not disk bound because my %util for each device is very low (no more than 5%). Given that I don't seem to be CPU bound or disk bound, why is top reporting such high load? Additionally, since I don't seem to be CPU bound or disk bound, why is my email sending script not able to keep up? Here's what I see when running top: top - 11:33:28 up 74 days, 18:49, 2 users, load average: 7.65, 8.79, 8.28 Tasks: 168 total, 5 running, 162 sleeping, 0 stopped, 1 zombie Cpu(s): 38.9%us, 58.6%sy, 0.8%ni, 0.0%id, 0.7%wa, 0.2%hi, 0.8%si, 0.0%st Mem: 3083012k total, 2144436k used, 938576k free, 281136k buffers Swap: 2048248k total, 39164k used, 2009084k free, 1470412k cached Here's what I see when running iostat -mx: avg-cpu: %user %nice %system %iowait %steal %idle 34.80 1.20 55.24 0.37 0.00 8.38 Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util sda 0.19 71.70 1.59 29.45 0.02 0.07 5.90 0.55 17.82 1.16 3.59 sda1 0.00 0.00 0.00 0.00 0.00 0.00 7.10 0.00 13.80 13.72 0.00 sda2 0.05 50.45 1.13 24.57 0.01 0.29 24.25 0.35 13.43 1.15 2.97 sda3 0.05 10.17 0.20 2.33 0.01 0.05 43.75 0.05 20.96 2.45 0.62 sda4 0.00 0.00 0.00 0.00 0.00 0.00 2.00 0.00 70.50 70.50 0.00 sda5 0.07 0.22 0.03 0.07 0.00 0.00 32.84 0.08 856.19 8.03 0.08 sda6 0.02 5.45 0.03 0.72 0.00 0.02 67.55 0.02 26.72 5.26 0.39 sda7 0.00 1.56 0.00 0.42 0.00 0.01 38.04 0.00 8.88 5.84 0.24 sda8 0.01 3.84 0.20 1.35 0.00 0.02 28.55 0.05 31.90 4.08 0.63 Here's what I see when running sar: 09:40:02 AM CPU %user %nice %system %iowait %steal %idle 09:50:01 AM all 30.59 1.01 49.80 0.23 0.00 18.37 10:00:08 AM all 31.73 0.92 51.66 0.13 0.00 15.55 10:10:06 AM all 30.43 0.99 48.94 0.26 0.00 19.38 10:20:01 AM all 29.58 1.00 47.76 0.25 0.00 21.42 10:30:01 AM all 29.37 1.02 47.30 0.18 0.00 22.13 10:40:06 AM all 32.50 1.01 52.94 0.16 0.00 13.39 10:50:01 AM all 30.49 1.00 49.59 0.15 0.00 18.77 11:00:01 AM all 29.43 0.99 47.71 0.17 0.00 21.71 11:10:07 AM all 30.26 0.93 49.48 0.83 0.00 18.50 11:20:02 AM all 29.83 0.81 48.51 1.32 0.00 19.52 11:30:06 AM all 31.18 0.88 51.33 1.15 0.00 15.47 Average: all 26.21 1.15 42.62 0.48 0.00 29.54 Here are the top handful of processes listed at the particular time I happened to run top -c: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 8180 mysql 16 0 57448 19m 2948 S 26.6 0.7 4702:26 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/bristno.pid --skip-external-locking 26956 brristno 17 0 0 0 0 Z 8.0 0.0 0:00.24 [php] <defunct> 26958 brristno 17 0 94408 43m 37m R 5.0 1.4 0:00.15 /usr/bin/php /home/brristno/public_html/dbv.php 22852 nobody 16 0 9628 2900 1524 S 0.7 0.1 0:00.17 /usr/local/apache/bin/httpd -k start -DSSL 8591 brristno 34 19 96896 13m 6652 S 0.3 0.4 0:29.82 /usr/local/bin/php /home/brristno/bin/mailer.php 1qwqyb6 i0gbor 24469 nobody 16 0 9628 2880 1508 S 0.3 0.1 0:00.08 /usr/local/apache/bin/httpd -k start -DSSL 25495 nobody 15 0 9628 2876 1500 S 0.3 0.1 0:00.06 /usr/local/apache/bin/httpd -k start -DSSL 26149 nobody 15 0 9628 2864 1504 S 0.3 0.1 0:00.04 /usr/local/apache/bin/httpd -k start -DSSL

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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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  • How can I upgrade Ubuntu from 9.10 to 10.04 on a netbook with a 4GB root partition?

    - by Blorgbeard
    I have an Asus EeePC 901, running Ubuntu 9.10. I'd like to upgrade it to 10.04. I don't want to reinstall, since I have a bunch of scripts and programs all set up. However, when I attempt to upgrade using sudo apt-get dist-upgrade, I get an error asking me to free up another ~600MB on /. My / is mounted on sda0, which is a 4GB SSD. I do not have 600MB worth of deletable stuff on /. I've emptied my trash, and done apt-get autoremove and apt-get clean. I do have plenty of space in /home, mounted on sda1 (a 16GB SSD). Is there some way I can tell apt-get to use a different download/temp directory?

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  • Explanation of nodev and nosuid in fstab

    - by Ivan Kovacevic
    I see those two options constantly suggested on the web when someone describes how to mount a tmpfs or ramfs. Often also with noexec but I'm specifically interested in nodev and nosuid. I basically hate just blindly repeating what somebody suggested, without real understanding. And since I only see copy/paste instructions on the net regarding this, I ask here. This is from documentation: nodev - Don't interpret block special devices on the filesystem. nosuid - Block the operation of suid, and sgid bits. But I would like a practical explanation what could happen if I leave those two out. Let's say that I have configured tmpfs or ramfs(without these two mentioned options set) that is accessible(read+write) by a specific (non-root)user on the system. What can that user do to harm the system? Excluding the case of consuming all available system memory in case of ramfs

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  • unable to start apache after changes to rc.conf and resov.conf

    - by shupru
    I had a working configuration this morning with the following simple /etc/rc.conf ifconfig_rl0="DHCP" ifconfig_xl="inet 192.168.1.11 netmask 255.255.255." defaultrouter="192.168.1.1" I added the following lines: firewall_enable="YES" firewall_type="SIMPLE" firewall_logging="YES" sshd_enable="YES" apache_enable="YES" mysql_enable="YES" my httpd.conf includes: NameVirtualHost 192.168.1.11 <VirtualHost 192.168.1.11> ... </VirtualHost> now apache and ssh server are down. changed rc.conf back to last working configuration and still no ssh or apache apachectl start #--> /usr/local/sbin/apachectl start: httpd could not be started apachectl status #--> Looking up localhost Making http connection to localhost Alert!: Unable to connect to remote host.

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  • Macvlan based interface pings from host but not from namespace

    - by jtlebi
    My setup: Private network vboxnet1 10.0.7.0/24 1 Host, ubuntu desktop 1 VM, ubuntu server (VirtualBox) Adressing layout: HOST: 10.0.7.1 VM: 10.0.7.101 VM MAC NAMESPACE: 10.0.7.102 On the VM, I ran the following commands: ip netns add mac # create a new nmespace ip link add link eth0 mac0 type macvlan # create a new macvlan interface ip link set mac0 netns mac On the mac namespace, inside the VM: ip link set lo up ip link set mac up ip addr add 10.0.7.102/24 dev mac0 So that we basically end up with: (Like Inception ?) +------------------------+ | Host: 10.0.7.1 | | | | +--------------------+ | | | VM: 10.0.7.101 | | | | | | | | +----------------+ | | | | | NS: 10.0.7.102 | | | | | | | | | | | +----------------+ | | | +--------------------+ | +------------------------+ What works: Ping between Host and VM Ping between NS and NS dhclient from NS What does not work: ping between NS and VM ping between NS and Host Where I started to go nuts: tcpdump on host (the real machine) actually shows ARP request AND replies tcpdump on NS shows ARP requests sent to the host tcpdump on VM makes the whole mess work (!) -- ping starts to get answers when tcpdump is started on the VM ?!? So, I bet you were eager for it, my question is: how to I make it work ? I suspect something's wrong with ARP on the macvlan inside the NS but can't figure out what exactly... Btw, I did the same expérimentations with the mac0 interface directly on the VM (no namespace) and it worked flawlessly.

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  • Formatting pwd/ls for use with scp

    - by eumiro
    I have two terminal windows with bash. One is local on the client computer, another one has an SSH-session on the server. On the server, I am in a directory and seeing a file I would like to copy to my client using scp from the client. On the server I see: user@server:/path$ ls filename filename I can now type scp in the client shell, select and copy the user@server:/path from the server shell and paste to the client shell, then type slash and copy and paste the filename and append a dot to get: user@client:~$ scp user@server:/path/filename . to scp a file from the server to the client. Now I am searching for a command on the server, that would work like this: user@server:/path$ special_ls filename user@server:/path/filename which would give me the complete scp-ready string to copy&paste to the client shell. Something in the form echo $USER@$HOSTNAME:${pwd}/$filename working with relative/absolute paths. Is there any such command/switch combination or do I have to hack it myself? Thank you very much.

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  • OpenVPN access to a private network

    - by Gior312
    There are many similar topics about my issue, however I cannot figure out a solution for myself. There are three hosts. A without a routable address but with an Internet access. Server S with a routable Internet address and host B behind NAT in a private network. What I've managed to do is a OpenVPN connection between A and B via S. Everything works fine so far according to this manual VPN Setup What I want to do is to connect A to Bs private network 10.A.B.x I tried this manual but had no luck. So A has a vpn address 10.9.0.10, B's vpn address is 10.9.0.6 and B's private network is 10.20.20.0/24. When at the Server I try to make a route to Bs private network like this sudo route add 10.20.20.0 netmask 255.255.255.0 gw 10.9.0.6 dev tun0 it says "route: netmask 000000ff doesn't make sense with host route" but I don't know how to tell Server to look for a private network in a different way. Do you know how can I make it right ?

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  • Background process and SIGHUP

    - by Charles Salvia
    My understanding is that a program that is associated with a terminal will receive the SIGHUP signal if that terminal is closed. This usually will terminate the program. I also know that you can use the nohup command along with the & symbol to run the program in the background, and disassociate it from the terminal so that the program is not terminated when the terminal closes (on log out.) However, suppose a program is run normally without nohup, but is then suspended using Cntl-Z. If the program is then resumed in the background using the bg command, will it receive the SIGHUP signal on log out? Or to put it another way: if I have a program which is already running, and I don't want to stop it but I'd like to log out, can I suspend it using Cntl-Z and run it in the background using bg? Or will the program be terminated when I log out?

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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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  • Using mongodump with an auth enabled mongodb server

    - by bb-generation
    I'm trying to do a daily backup of my mongodb server (auth enabled) using the mongodump tool. mongodump provides two parameters to set the credentials: -u [ --username ] arg username -p [ --password ] arg password Unfortunately they don't provide any parameter to read the password from stdin. Therefore everytime I run this command, everyone on the server can read the password (e.g. by using ps aux). The only workaround I have found is stopping the database and directly accessing the database files using the --dbpath parameter. Is there any other solution which allows me to backup the mongodb database without stopping the server and without "publishing" my password? I am using Debian squeeze 6.0.5 amd64 with mongodb 1.4.4-3.

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  • /etc/exports file not read on boot

    - by netimen
    I added some entries into my /etc/exports file. But when I boot my system, the file is not read. I check it by sudo exportfs — it returns nothing (also I can't mount the exported folders on other systems). Then I run sudo expotfs -a and then again sudo exportfs — and now all my exported folders are listed (and now I can mount the exported folders on other systems). I'm running kubuntu 9.04 with 2.6.28-11-generic kernel

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  • Rails /tmp/cache/assets permissions issue using Debian virtual machine hosted on OS X Lion

    - by Jim
    I am running Parallels Desktop 7 on OS X Lion. I have a VM with Debian installed, and inside that VM I setup a Rails development environment. I am using Parallels Tools to share out my OS X home directory to the VM - the goal here is to run the Rails server on the VM, but host the files on OS X (so they are automatically backed up, and so I can use tools like Textmate to develop with). Everything seems to work with the shared directory - my Debian user can read, write, and execute files. However, when I cloned a recent Rails project from Git, I got an error message when it tried to compile the CSS assets. My symptoms are exactly the same as in the question: http://stackoverflow.com/questions/7556774/rails-sprocket-error-compiling-css-assest-chown-issue I believe this is permissions-based, but it is really weird. My entire Rails project directory has permissions set to 777 and my Debian user owns it. If I navigate into /tmp/cache/assets, those permissions are the same. However, the three-character directories Rails is creating (DCE, DA1, D05, etc...) are being created without write permissions! If I refresh the Rails page a few times, about 4 or 5 (with Rails creating new three-character directories every time), eventually it will create one of the directories with the proper 777 permissions and everything will work! This will persist until I make a change to the CSS files and it has to recompile. Does anyone have any idea what might be going on here? I can't fathom why it is creating temp directories with incorrect permissions, or why after a few refreshes the good permissions kick in and it works... It definitely seems to be an issue with the share, since if I move the project into a different directory on the VM, it seems to work fine. On the OS X side, I've given the shared folder 777 permissions as well, but no dice...any ideas? Update I've found that the number of times I need to refresh before it works is not random - it has to do with how many assets are being compiled. For example, if I edit one of my CSS files, and there are four CSS files in the app/assets/stylesheets directory, I have to refresh four times before the app will finally work without the operation not permitted error...

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  • SQUID Transparent SSL proxy (no intercept)

    - by user974896
    I know how to have squid work as a transparent proxy. You put it into transparent mode then use your router or IPTABLES to forward port 80 to the squid port. I would like to do the same for SSL. Every guide I see mentions setting up keys on the squid server. I do not want squid to actually decrypt the SSL traffic then establish a connection with the server, rather I would like squid to simply forward the SSL traffic as is. The only thing I would like to do is be able to check the SSL request for any offending IPs and drop the packets if the destination is one of them.

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  • FTP server (vsftpd) with webgui

    - by manutenfruits
    I want to build a file server to make users able to upload and download mostly multimedia, but also common files. Right now I have an Arch installation with vsftpd and I'm about to install miniDLNA for multimedia sharing. The only problem is that FTP doesn't seem to fit my needs, because almost always makes the users need a client such as FileZilla to make the server friendly. I have been looking for a web frontend for vsftp but apart from management interfaces there's nothing. I need a frontend accessible from a browser through which users can navigate throught the folders in an easier and more elegant way than the plain FTP display that browsers make by default. It should be able to let users upload files and, as an awesome extra, let them play the multimedia directly on the browser. For this, I am willing to dump FTP if needed, I've heard about HTTP File Servers but don't know too much about it. I could code everything myself, but there's gotta be something out there already.

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  • Hung Java JVM failing to respond to kill -3

    - by Hans
    I have a Java VM that is hanging "randomly". I quote the randomly bit, because there is obviously a reason that the VM is hanging, but the hang does not occur periodically. We have the same software running in different customer environments and in those environments the JVM is not hanging. In the process of attempting to troubleshoot the hang the process exists with zero CPU utilization. I then attempt to execute kill -3 and the kill command hangs. No JVM Thread Dump is produced. I have spent time instrumenting the code to periodically log the thread stack traces hoping to catch the JVM in a state that would indicate where the issue lies, but so far this attempt has not born much fruit. Unfortunately I have not been able to reproduce this issue in my lab environment so I am limited by what can be done at the Customer site. The OS's in question are Red Hat Enterprise 5.4 and SUSE 10 running java version 1.6.0_05-b13 Has anyone had this problem? Any ideas on why kill -3 is failing to produce a Java Thread Dump? Thanks!

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  • Preferred apache permissions for www files with several authors

    - by user1316464
    I can't for the life of me figure out how to design my permissions scheme for my apache files. My requirements seem pretty simple: Apache should have standard permissions of RX for Directories and R for files Web authors should have RWX for Directories and RW for files Don't want to give any access to "other" Want new files/folders to inherit the proper permissions Here are the schemes I've tried 570 for directories and 460 for files Owner: Apache Group: Webdev The problem here is that new files created by users int the Webdev group are owned by user:Webdev and Apache can't read them. If Apache were in the group Webdev then it would also have the wrong permissions (ie it would have Write permissions to files) 750 for directories and 640 for files Owner: Webdev Group: Apache (Webdev is a member of Apache) The problem here is that there is only one webdev account and I have multiple people who need access to contribute. In theory this would work with only one developer if Webdev were also a member of the Apache group. Any ideas?

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  • What exactly interpret #!/bin/bash line?

    - by vava
    Many scripts in different languages have a #!/bin/bash header with a path to interpreter, so they can be executed without explicit call to interpreter from command line. But what exactly reads this line and run the interpreter, is it shell or kernel?

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  • Smokeping monitoring IP address and port

    - by bob
    Hi I have successfully install smokeping on my Ubuntu Karmic machine and am monitoring servers. I need to be able to monitor an IP address and a port, can someone tell me how I do that? I looked into Smokeping::probes::TCPPing but I cannot find how to install TCPPing Any help would be much appreciated Thanks

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  • Issue changing mysql password on Debian

    - by Sean
    I installed mysql on my Debian server. I couldn't get into the database because it kept saying I put in the wrong password so I looked on the internet and found that I could log onto mysql using the command sudo mysql --defaults-file=/etc/mysql/debian.cnf From there I went typed use mysql;then mysql> UPDATE user SET password=PASSWORD('password') WHERE user='root'; Which I know switched the password because I typed the command select Host, User, Password from user; And it showed the encrypted characters had changed for all three of the root user categories. But I am still not able to login to mysql using mysql -u root -p

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  • Getting permission denied error

    - by JM4
    On my Media Temple DV 4.0 server I am getting permission denied errors: -bash: cd: httpdocs: Permission denied If I switch from my login user to sudo (sudo su) or switch to root using su-, I can access the directory with any issue. This is just my site's files directory though so not sure why I'm being denied. Additionally, I added my user to the visudo commands file with: user ALL=(ALL) ALL Any suggestions to what else could be the issue?

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  • 3 simple questions about file permissions

    - by Camran
    1- Wonder, is this a good setup of permissions in the /var directory? drwxr-xr-x 2 root root 4096 2010-05-30 03:34 backups drwxr-xr-x 7 root root 4096 2010-05-29 17:55 cache drwxr-xr-x 29 root root 4096 2010-05-29 17:55 lib drwxrwsr-x 2 root staff 4096 2009-07-14 04:36 local drwxrwxrwt 3 root root 60 2010-06-02 03:34 lock drwxr-xr-x 9 root root 4096 2010-06-02 03:34 log drwxrwsr-x 2 root man 4096 2009-09-20 20:36 mail drwxr-xr-x 2 root root 4096 2009-09-20 20:36 opt drwxrwxrwt 12 root root 420 2010-06-02 12:12 run drwxr-xr-x 4 root root 4096 2009-09-20 20:37 spool drwxrwxrwt 2 root root 4096 2009-07-14 04:36 tmp drwxr-xr-x 14 user root 4096 2010-05-30 22:21 www 2- Could you give me a brief explanation of the columns above? First one is which permissions they have. Second is a nr. Third and fourth says "root root" for example. fifth is another nr (4096 for example). and the others are obvious. 3- Could you give me a brief explanation of the folders above? Especially the "lock" and "tmp" folders. Lock contains an apache2 folder which seems empty. Thanks

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