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  • Very Large number of connections in TIME_WAIT state; Server is slow, ipconntrac

    - by Sparsh Gupta
    I have a nginx server with load balancing and reverse proxy. Right now its behing another nginx but very soon I plan to make it front, where it will receive TCP connections from clients directly at a rate of 500req/second I am having some big troubles with the server. I have pasted my configurations here and I am kinda sure that the problem is with ipconntrac and similar things which are alient to me http://paste.org/pastebin/view/28543 root@load_balancer:/proc/sys/net/ipv4# netstat -an|awk '/tcp/ {print $6}'|sort|uniq -c 67 CLOSING 727 ESTABLISHED 173 FIN_WAIT1 183 FIN_WAIT2 19 LAST_ACK 5 LISTEN 447 SYN_RECV 1 SYN_SENT 27970 TIME_WAIT Its a ubuntu machine with mainly nginx (load balancer and reverse proxy) installed. It surely isnt great. Can you help me understand whats going on and how can I fix it. This is my live server and I am sure its in a bad shape right now. Any document or commands to fix this, or settings I should make to make this better and reduce time wait and fin_wait1/2 better would be awesome.

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  • Will this increase my VPS failing rate ?

    - by Spencer Lim
    Will this increase my Virtual private Server failing rate if i :- install Microsoft Window Server 2008 Enterprise install SQL server enterprise 2008 install IIS 7.5 install ASP.Net Mvc 2 install Microsoft Exchange install Team foundation server on one mini VPS with specification of DELL Poweredge R710 shared plan DDR3 ECC RAMs 16GB and -- 1GB for this VPS using DELL PERC 6i raid controller (this thing alone about 1.5k-2k) and the SAS HDD (15K RPM) (146GB) -- 33GB to this VPS each hdd is freaking fast over 300MB read / write possible with proper tuning the motherboard is a DELL and it has twin redundant PSU (870watt 85%eff) its running on Intel Xeon 5502 (Quad Core) x2 so about 8 physical proc (fairly share) is there any ruler for this about one VPS can only install what what what service ? Thx for reply

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  • why dstat failed with --tcp option?

    - by hugemeow
    why --tcp option failed? should i install some package? if yes, which package i should install? this question is not the same as http://stackoverflow.com/questions/10475991/tcp-sockets-double-messages dstat --tcp Module tcp has problems. (Cannot open file /proc/net/tcp6.) None of the stats you selected are available. what is the problem with module tcp, how to find the problem? what i should do in order to fix this issue?

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  • Caching DNS server (bind9.2) CPU usage is so so so high.

    - by Gk
    Hi, I have a caching-only dns server which get ~3k queries per second. Here is specs: Xeon dual-core 2,8GHz 4GB of RAM Centos 5x (kernel 2.6.18-164.15.1.el5PAE) bind 9.4.2 rndc status: recursive clients: 666/4900/5000 About 300 new queries (not in cache) per second. Bind always uses 100% on one core on single-thread config. After I recompiled it to multi-thread, it uses nearly 200% on two core :( No iowait, only sys and user. I searched around but didn't see any info about how bind use CPU. Why does it become bottleneck? One more thing, here is RAM usage: cat /proc/meminfo MemTotal: 4147876 kB MemFree: 1863972 kB Buffers: 143632 kB Cached: 372792 kB SwapCached: 0 kB Active: 1916804 kB Inactive: 276056 kB I've set max-cache-size to 0 to make sure bind can use as much RAM as it want, but it always stop at ~2GB. Since every second we got not cached queries so theoretically RAM must be exhausted but it wasn't. Do you have any idea? TIA, -Gk

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  • Setup routing and iptables for new VPN connection to redirect **only** ports 80 and 443

    - by Steve
    I have a new VPN connection (using openvpn) to allow me to route around some ISP restrictions. Whilst it is working fine, it is taking all the traffic over the vpn. This is causing me issues for downloading (my internet connection is a lot faster than the vpn allows), and for remote access. I run an ssh server, and have a daemon running that allows me to schdule downloads via my phone. I have my existing ethernet connection on eth0, and the new VPN connection on tun0. I believe I need to setup the default route to use my existing eth0 connection on the 192.168.0.0/24 network, and set the default gateway to 192.168.0.1 (my knowledge is shaky as I haven't done this for a number of years). If that is correct, then I'm not exactly sure how to do it!. My current routing table is: Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface MSS Window irtt 0.0.0.0 10.51.0.169 0.0.0.0 UG 0 0 0 tun0 0 0 0 10.51.0.1 10.51.0.169 255.255.255.255 UGH 0 0 0 tun0 0 0 0 10.51.0.169 0.0.0.0 255.255.255.255 UH 0 0 0 tun0 0 0 0 85.25.147.49 192.168.0.1 255.255.255.255 UGH 0 0 0 eth0 0 0 0 169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0 0 0 0 192.168.0.0 0.0.0.0 255.255.255.0 U 1 0 0 eth0 0 0 0 After fixing the routing, I believe I need to use iptables to configure prerouting or masquerading to force everything for destination port 80 or 443 over tun0. Again, I'm not exactly sure how to do this! Everything I've found on the internet is trying to do something far more complicated, and trying to sort the wood from the trees is proving difficult. Any help would be much appreciated. UPDATE So far, from the various sources, I've cobbled together the following: #!/bin/sh DEV1=eth0 IP1=`ifconfig|perl -nE'/dr:(\S+)/&&say$1'|grep 192.` GW1=192.168.0.1 TABLE1=internet TABLE2=vpn DEV2=tun0 IP2=`ifconfig|perl -nE'/dr:(\S+)/&&say$1'|grep 10.` GW2=`route -n | grep 'UG[ \t]' | awk '{print $2}'` ip route flush table $TABLE1 ip route flush table $TABLE2 ip route show table main | grep -Ev ^default | while read ROUTE ; do ip route add table $TABLE1 $ROUTE ip route add table $TABLE2 $ROUTE done ip route add table $TABLE1 $GW1 dev $DEV1 src $IP1 ip route add table $TABLE2 $GW2 dev $DEV2 src $IP2 ip route add table $TABLE1 default via $GW1 ip route add table $TABLE2 default via $GW2 echo "1" > /proc/sys/net/ipv4/ip_forward echo "1" > /proc/sys/net/ipv4/ip_dynaddr ip rule add from $IP1 lookup $TABLE1 ip rule add from $IP2 lookup $TABLE2 ip rule add fwmark 1 lookup $TABLE1 ip rule add fwmark 2 lookup $TABLE2 iptables -t nat -A POSTROUTING -o $DEV1 -j SNAT --to-source $IP1 iptables -t nat -A POSTROUTING -o $DEV2 -j SNAT --to-source $IP2 iptables -t nat -A PREROUTING -m state --state ESTABLISHED,RELATED -j CONNMARK --restore-mark iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j CONNMARK --restore-mark iptables -t nat -A PREROUTING -i $DEV1 -m state --state NEW -j CONNMARK --set-mark 1 iptables -t nat -A PREROUTING -i $DEV2 -m state --state NEW -j CONNMARK --set-mark 2 iptables -t nat -A PREROUTING -m connmark --mark 1 -j MARK --set-mark 1 iptables -t nat -A PREROUTING -m connmark --mark 2 -j MARK --set-mark 2 iptables -t nat -A PREROUTING -m state --state NEW -m connmark ! --mark 0 -j CONNMARK --save-mark iptables -t mangle -A PREROUTING -i $DEV2 -m state --state NEW -p tcp --dport 80 -j CONNMARK --set-mark 2 iptables -t mangle -A PREROUTING -i $DEV2 -m state --state NEW -p tcp --dport 443 -j CONNMARK --set-mark 2 route del default route add default gw 192.168.0.1 eth0 Now this seems to be working. Except it isn't! Connections to the blocked websites are going through, connections not on ports 80 and 443 are using the non-VPN connection. However port 80 and 443 connections that aren't to the blocked websites are using the non-VPN connection too! As the general goal has been reached, I'm relatively happy, but it would be nice to know why it isn't working exactly right. Any ideas? For reference, I now have 3 routing tables, main, internet, and vpn. The listing of them is as follows... Main: default via 192.168.0.1 dev eth0 10.38.0.1 via 10.38.0.205 dev tun0 10.38.0.205 dev tun0 proto kernel scope link src 10.38.0.206 85.removed via 192.168.0.1 dev eth0 169.254.0.0/16 dev eth0 scope link metric 1000 192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.73 metric 1 Internet: default via 192.168.0.1 dev eth0 10.38.0.1 via 10.38.0.205 dev tun0 10.38.0.205 dev tun0 proto kernel scope link src 10.38.0.206 85.removed via 192.168.0.1 dev eth0 169.254.0.0/16 dev eth0 scope link metric 1000 192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.73 metric 1 192.168.0.1 dev eth0 scope link src 192.168.0.73 VPN: default via 10.38.0.205 dev tun0 10.38.0.1 via 10.38.0.205 dev tun0 10.38.0.205 dev tun0 proto kernel scope link src 10.38.0.206 85.removed via 192.168.0.1 dev eth0 169.254.0.0/16 dev eth0 scope link metric 1000 192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.73 metric 1

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  • Linux with Windows XP vmware guest unable to access certain Internet hosts

    - by unknown
    hi I have annoying problem. My setup is the following: debian Linux, 64 bits, VMWare workstation 7 host, with Windows XP running as guest. From Firefox, or Internet Explorer, I am unable to access few sites, for example nvidia.com, osdir. Basically get connection timed out, on the other hand ping works to those sites. Moreover, Slashdot loads very very slow and sometimes gets horrible text-only version. everything works fine on Linux host I suspect it has something to do with routing on Linux, I recall having similar problem long time ago, which was fixed by setting something in /proc. I tried setting MTU and TCP window size on Windows lower, but did not help Any idea what is going on?

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  • why my server has a dir named "?"

    - by liuxingruo
    These are all the dirs in my server: ? bin boot dev etc home lib lost+found media media2 misc mnt net opt proc root sbin selinux srv sys tmp usr var why there is a "?" dir? Thanks very much. BTW: the touch command was found on my server(wiered). I list the bin dir: alsacard cp dd env hostname loadkeys more ps sed tcptraceroute alsaunmute cpio df ex igawk loadkeys.static mount pwd setfont traceroute6 arch csh dmesg false ipcalc logger mountpoint raw setserial tracert awk cut dnsdomainname fgrep kbd_mode login mv red sh view basename date doexec gawk keyctl ls netstat redhat_lsb_init sleep ypdomainname bash dbus-cleanup-sockets domainname gettext kill mail nice rm sort cat dbus-daemon dumpkeys grep ksh mailx nisdomainname rmdir stty chgrp dbus-monitor echo gtar ksh93 mkdir pgawk rpm su chmod dbus-send ed gunzip link mknod ping rvi sync chown dbus-uuidgen egrep gzip ln mktemp ping6 rview tar touch is missing, how can i get it back?

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  • how to portforward port 7300 from server A to server B

    - by Patrick van Hout
    hi, We are using Stunnel. But want to replace it is with an iptables entry if possible. 192.168.123.122:7300 need to be forwarded to 192.168.123.188:7300. So in iptables I set these two entries: [root@dev ~]# iptables -t nat -A PREROUTING -p tcp --dport 7300 -j DNAT --to-destination 192.168.123.188:7300 [root@dev ~]# iptables -A FORWARD -m state -p tcp -d 192.168.123.188 --dport 7300 --state NEW,ESTABLISHED,RELATED -j ACCEPT But it isn't working. I did check that /proc/sys/net/ipv4/conf/eth0/forwarding has the value "1" inside. Any tips or hints? thanks, Patrick

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  • Fingerprint of PEM ssh key

    - by Unknown
    I have a PEM file which I add to a running ssh-agent: $ file query.pem query.pem: PEM RSA private key $ ssh-add ./query.pem Identity added: ./query.pem (./query.pem) $ ssh-add -l | grep query 2048 ef:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX ./query.pem (RSA) My question is how I can get the key fingerprint I see in ssh-agent directly from the file. I know ssh-keygen -l -f some_key works for "normal" ssh keys, but not for PEM files. If I try ssh-keygen on the .pem file, I get: $ ssh-keygen -l -f ./query.pem key_read: uudecode PRIVATE KEY----- failed key_read: uudecode PRIVATE KEY----- failed ./query.pem is not a public key file. This key starts with: -----BEGIN RSA PRIVATE KEY----- MIIEp.... etc. as opposed to a "regular" private key, which looks like: -----BEGIN RSA PRIVATE KEY----- Proc-Type: 4,ENCRYPTED DEK-Info: AES-128-CBC,E15F2.... etc.

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  • Using wget to download pdf files from a site that requires cookies to be set

    - by matt74tm
    I want to access a newspaper site and then download their epaper copies (in PDF). The site requires me to login using my email address and password and then it permits me to access those PDF URLs. I'm having trouble 'setting my session' in wget. When I login into the site from my browser, it sets two cookie values: [email protected] Password=12345 I tried: wget --post-data "[email protected]&Password=12345" http://epaper.abc.com/login.aspx However, that just downloaded the login page and saved it locally The FORM on the login page has two fields: txtUserID txtPassword and radiobuttons like this: <input id="rbtnManchester" type="radio" checked="checked" name="txtpub" value="44"> Another button: <input id="rbtnLondon" type="radio" name="txtpub" value="64"> If I post this to the login.aspx page, I get the same output wget --post-data "[email protected]&txtPassword=12345&txtpub=44" http://epaper.abc.com/login.aspx If I do: --save-cookies abc_cookies.txt it doesnt seem to have anything other than the default content. For the last if I do --debug as well it says: ... Set-Cookie: ASP.NET_SessionId=05kphcn4hjmblq45qgnjoe41; path=/; HttpOnly ... Stored cookie epaper.abc.com -1 (ANY) / <session> <insecure> [expiry none] ASP.NET_SessionId 05kphcn4hjmblq45qgnjoe41 Length: 107253 (105K) [text/html] Saving to: `login.aspx' ... Saving cookies to abc_cookies.txt. However, abc_cookies.txt shows ONLY the following: # HTTP cookie file. # Generated by Wget on 2011-08-16 08:03:05. # Edit at your own risk. (Not sure why I'm not getting any responses on SO - perhaps SU is a better forum - http://stackoverflow.com/questions/7064171/using-wget-to-download-pdf-files-from-a-site-that-requires-cookies-to-be-set) EDIT 1 C:\Temp>wget --cookies=on --keep-session-cookies --save-cookies abc_cookies.txt --post-data "txtUserID=abc%40gmail.com&txtPassword=password&txtpub=44&chkbox=checkbox&submit.x=48&submit.y=7" http://epaper.abc.com/login.aspx --debug SYSTEM_WGETRC = c:/progra~1/wget/etc/wgetrc syswgetrc = C:\Program Files (x86)\GnuWin32/etc/wgetrc DEBUG output created by Wget 1.11.4 on Windows-MinGW. --2011-08-18 08:15:59-- http://epaper.abc.com/login.aspx Resolving epaper.abc.com... seconds 0.00, 999.999.99.99 Caching epaper.abc.com => 999.999.99.99 Connecting to epaper.abc.com|999.999.99.99|:80... seconds 0.00, connected. Created socket 300. Releasing 0x00a2ae80 (new refcount 1). ---request begin--- POST /login.aspx HTTP/1.0 User-Agent: Wget/1.11.4 Accept: */* Host: epaper.abc.com Connection: Keep-Alive Content-Type: application/x-www-form-urlencoded Content-Length: 100 ---request end--- [POST data: txtUserID=abc%40gmail.com&txtPassword=password&txtpub=44&chkbox=checkbox&submit.x=48&submit.y=7] HTTP request sent, awaiting response... ---response begin--- HTTP/1.1 200 OK Connection: keep-alive Date: Thu, 18 Aug 2011 02:46:17 GMT Server: Microsoft-IIS/6.0 X-Powered-By: ASP.NET X-AspNet-Version: 2.0.50727 Set-Cookie: ASP.NET_SessionId=owcrje55yl45kgmhn43gq145; path=/; HttpOnly Cache-Control: private Content-Type: text/html; charset=utf-8 Content-Length: 107253 ---response end--- 200 OK Registered socket 300 for persistent reuse. Stored cookie epaper.abc.com -1 (ANY) / <session> <insecure> [expiry none] ASP.NET_SessionId owcrje55yl45kgmhn43gq145 Length: 107253 (105K) [text/html] Saving to: `login.aspx.1' 100%[======================================================================================================================>] 107,253 24.9K/s in 4.2s 2011-08-18 08:16:05 (24.9 KB/s) - `login.aspx.1' saved [107253/107253] Saving cookies to abc_cookies.txt. Done saving cookies. C:\Temp>wget --referer=http://epaper.abc.com/login.aspx --cookies=on --load-cookies abc_cookies.txt --keep-session-cookies --save-cookies abc_cookies.txt http://epaper.abc.com/PagePrint/16_08_2011_001.pdf --debug SYSTEM_WGETRC = c:/progra~1/wget/etc/wgetrc syswgetrc = C:\Program Files (x86)\GnuWin32/etc/wgetrc DEBUG output created by Wget 1.11.4 on Windows-MinGW. Stored cookie epaper.abc.com -1 (ANY) / <session> <insecure> [expiry none] ASP.NET_SessionId owcrje55yl45kgmhn43gq145 --2011-08-18 08:16:12-- http://epaper.abc.com/PagePrint/16_08_2011_001.pdf Resolving epaper.abc.com... seconds 0.00, 999.999.99.99 Caching epaper.abc.com => 999.999.99.99 Connecting to epaper.abc.com|999.999.99.99|:80... seconds 0.00, connected. Created socket 300. Releasing 0x00598290 (new refcount 1). ---request begin--- GET /PagePrint/16_08_2011_001.pdf HTTP/1.0 Referer: http://epaper.abc.com/login.aspx User-Agent: Wget/1.11.4 Accept: */* Host: epaper.abc.com Connection: Keep-Alive Cookie: ASP.NET_SessionId=owcrje55yl45kgmhn43gq145 ---request end--- HTTP request sent, awaiting response... ---response begin--- HTTP/1.1 200 OK Connection: keep-alive Date: Thu, 18 Aug 2011 02:46:30 GMT Server: Microsoft-IIS/6.0 X-Powered-By: ASP.NET X-AspNet-Version: 2.0.50727 content-disposition: attachement; filename=Default_logo.gif Cache-Control: private Content-Type: image/GIF Content-Length: 4568 ---response end--- 200 OK Registered socket 300 for persistent reuse. Length: 4568 (4.5K) [image/GIF] Saving to: `16_08_2011_001.pdf' 100%[======================================================================================================================>] 4,568 7.74K/s in 0.6s 2011-08-18 08:16:14 (7.74 KB/s) - `16_08_2011_001.pdf' saved [4568/4568] Saving cookies to abc_cookies.txt. Done saving cookies. Contents of abc_cookies.txt epaper.abc.com FALSE / FALSE 0 ASP.NET_SessionId owcrje55yl45kgmhn43gq145

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  • No free disk space ;[

    - by skomak
    Hi I have weird situation because Linux df command says that there is no free disk space [root@backup cache]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda3 72G 70G 0 100% / /dev/sda1 190M 11M 170M 7% /boot tmpfs 248M 0 248M 0% /dev/shm but du -sh /* says [root@backup cache]# du -sh /* 4.0K /bacula-restores 7.4M /bin 5.4M /boot 3.6T /data 116K /dev 55M /etc 204K /home 76M /lib 16K /lost+found 12K /media 0 /misc 16K /mnt 8.0K /mount 0 /net 8.0K /opt 0 /proc 2.3G /root 32M /sbin 8.0K /selinux 168K /share 8.0K /srv 0 /sys 361M /test 20K /tmp 3.2G /usr 1.5G /var Could you tell me where is a problem? Where is my space? I can't figure it out :(

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  • Difference between tcp recv buffer and tcp receive window size?

    - by pradeepchhetri
    The command shows the tcp receive buffer size in bytes. $ cat /proc/sys/net/ipv4/tcp_rmem 4096 87380 4001344 where the three values signifies the min, default and max values respectively. Then I tried to find the tcp window size using tcpdump command. $ sudo tcpdump -n -i eth0 'tcp[tcpflags] & (tcp-syn|tcp-ack) == tcp-syn and port 80 and host google.com' tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes 16:15:41.465037 IP 172.16.31.141.51614 > 74.125.236.73.80: Flags [S], seq 3661804272, win 14600, options [mss 1460,sackOK,TS val 4452053 ecr 0,nop,wscale 6], length 0 I got the window size to be 14600 which is 10 times the size of MSS. Can anyone please tell me the relationship between the two.

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  • VMware Workstation on Linux: Dropping core files in a shared folder...

    - by kclittle
    I'm using VMware 6.0.2 on a RHEL 4.6 host. The VMs are MontaVista CGE 5.0 (2.6.21 kernel). I'm trying to get applications running in the VMs to drop any core files on a HGFS volume, i.e. in a "shared folder". The core files get created as per the path and format given in /proc/sys/kernel/core_pattern, but they are always zero length. If I change the path to a local path (on a virtual disk in the VM), all is well. Any ideas what I have to do get the core files written into a shared folder? Thanks for your help!

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  • Recover open but deleted file on Linux using ln instead of cp

    - by Yang
    Say I have a file that's downloading (from a source that's hard to re-download from), but accidentally deleted from the filesystem namespace (/tmp/blah), and I'd like to recover this file. Normally I could just cp /proc/$PID/fd/$FD /tmp/blah, but in this case that would only get me a partial snapshot, since the file is still downloading. Furthermore, once the download completes, the downloading process (e.g. Chrome) will close the FD. Any way to recover by inode/create a hard link? Any other solutions? If it makes any difference, I'm mainly concerned with ext4. Thanks in advance.

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  • How to test KVM guest CPU maximum allocation limit?

    - by Ace
    Running Ubuntu 13.04 Host and vm Guest. Using virtio for hdd, nic. Max-allocaion CPU cores is 6, minimum is 2. Ive made a vm with virt-manager just to play with, and to test out kvm. Alright, I have a decent understand how the memory balloon driver works, but I still dont know how to test if the guest OS can utilize the max setting for cpu cores. From what i gather, the host will start one thread of qemu for each core allocated per vm. When i run htop inside the guest, it only shows two cores. (also here is the output of cat /proc/cpuinfo: https://gist.github.com/anonymous/93a361545130923537da ) How can I "force" the guest to allocate the other 4 cores so that it can show 6 cores in htop? Is there a way to do this?

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  • Linux says a kernel module has an unknown symbol, but another loaded module provides it.

    - by raldi
    I'm trying to install a driver for a USB DAQ box, which annoyingly, I have to compile myself. I believe I've succeeded -- I have two .ko files: -rw-r--r-- 1 root root 45271 2010-03-18 21:24 advdrv_core.ko -rw-r--r-- 1 root root 24312 2010-03-18 21:24 usb4761.ko I was able to run insmod on the first without incident, but when I try on the second, I get a flood of messages: kernel: [686782.106547] usb4761: no symbol version for adv_process_info_check_event kernel: [686782.106555] usb4761: Unknown symbol adv_process_info_check_event kernel: [686782.106691] usb4761: no symbol version for advdrv_unregister_driver kernel: [686782.106695] usb4761: Unknown symbol advdrv_unregister_driver However, advdrv_core.ko provides these symbols. My kernel sure seems to have them in memory: # cat /proc/kallsyms | grep advdrv_unregister_driver f8d88504 r __ksymtab_advdrv_unregister_driver [advdrv_core] f8d888d2 r __kstrtab_advdrv_unregister_driver [advdrv_core] f8d885a4 r __kcrctab_advdrv_unregister_driver [advdrv_core] 086eb8fb a __crc_advdrv_unregister_driver [advdrv_core] f8d86e90 t advdrv_unregister_driver [advdrv_core] Why does my insmod claim they're unknown symbols?

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  • Munin "Available entropy" when using address space layout randomization

    - by clawspoon
    Having just configured munin for statistics logging on my gentoo server (hardened profile), I am noticing that my "Available entropy" is consitently in the 200-300 range. This seems way to low, so I checked it manually using the command $ cat /proc/sys/kernel/random/entropy_avail 3544 Odd. Consistently very low values in Munin and practically filled up when checking manually. After thinking about the problem for a while I came to the conclusion that the problem is probably that I'm using Adress Space Layout Randomization which is using the entropy when running commands/programs. Since Munin runs a whole slew of programs all the entropy is used up, and Munin then measures how much entropy there is, resulting in the low values. Does anyone have any experience with this? How can this be avoided?

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  • How can I view updatedb database content, and then exclude certain files/paths?

    - by rubo77
    The updatedb database on my debian server is quite slow. where is the database located and how can I view its content and find out if there are some paths with useless stuff, that I could add to the prunepaths? my /etc/updatedb.conf looks like this: ... # filesystems which are pruned from updatedb database PRUNEFS="NFS nfs nfs4 afs binfmt_misc proc smbfs autofs iso9660 ncpfs coda devpts ftpfs devfs mfs shfs sysfs cifs lustre_lite tmpfs usbfs udf" export PRUNEFS # paths which are pruned from updatedb database PRUNEPATHS="/tmp /usr/tmp /var/tmp /afs /amd /alex /var/spool /sfs /media /var/backups/rsnapshot /var/mod_pagespeed/" ... and how can I prune all paths that contain */.git/* and */.svn/* ?

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  • Clear / Flush cached memory

    - by TheDave
    I have a small VPS with 6GB RAM hosting a couple of websites. Recently I have noticed that my cached memory size is quite high - see below: Cpu(s): 0.1%us, 0.1%sy, 0.0%ni, 99.1%id, 0.0%wa, 0.2%hi, 0.4%si, 0.0%st Mem: 6113256k total, 5949620k used, 163636k free, 398584k buffers Swap: 1048564k total, 104k used, 1048460k free, 3586468k cached After investigating if there is some method to have this flushed or cleared I stumbled upon a command which is: sync; echo 3 > /proc/sys/vm/drop_caches I read it could be useful to add this to a chron-task/job. Is this method recommended or could this lead to potential problems? The only concern I have is that I use one Magento installation on Memcached - could this have any negative effects on it? I am certainly not a pro therefore I would very much appreciate some expert advise. PS: My VPS runs on CentOS 5 x64 and I have WHM + NGINX installed.

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  • Build and migrated to software raid (mdadm) on GPT disk, now can't assemble array

    - by John H
    mdadm, gpt issues, unrecognized partitions. Simplified question: How do I get mdadm to recognize GPT partitions? I have been attempting to convert/copy my Ubuntu 11.10 OS from a single drive to software raid 1. I have done similar in the past, but in this case, I was adding in a drive that has been configured for GPT and I tried to work with that without fully looking into the implications. Currently, I have a non-booting mdadm RAID 1 array of /dev/md127 (the OS assigned that and it keeps picking up). I am booting off of live USB keys, currently System Rescue CD from sysresccd. While gdisk and parted can see all the partitions, most of the OS utilities do not, including mdadm. My main goal is just to make the raid array accessible so I can get pull the data and start fresh (without using GPT). /dev/md127 /dev/sda /dev/sda1 <- GPT type partition /dev/sda1 <- exists within the GPT part, member of md127 /dev/sda2 <- exists within the GPT part, empty /dev/sdb /dev/sdb1 <- GPT type partition /dev/sdb1 <- exists within the GPT part, member of md127 History: POINT A: The original OS was install on sda (actually /dev/sda6). I used a the Ubuntu live usb to add sdb. I got warning from fdisk about GPT so I used gdisk to create a raid partition (sdb1) and mdadm to create a raid1 mirror with a missing drive. I had many issues getting this working (including being unable to get grub to install) but I eventually got it to boot using grub on sda and /dev/md127 off of sdb. So at point A, I had copied my OS from sda6 to md127 on sdb. I then booted into a rescue mode and attempted to get a bootloader onto sdb, which failed. I then discovered my mistake: I had installed the raid onto sdb instead of sdb1, essentially overwriting the sdb1 partition. POINT B: I now had two copies of my data- one on md127/sdb, and one on sda. I destroyed data on sda and created a new GPT table on sda. I then created sda1 for the raid array, and sda2 for a scratch partition. I added sda1 into the raid array and let it rebuild. md127 now covered /dev/sdb and /dev/sda1 as fully active and synced. POINT C: I rebooted onto linux rescue again and was still able to access the raid array. I then removed /dev/sdb from the array and created /dev/sdb1 for the raid. I added sdb1 to the array and let it sync. I was able to mount and access /dev/md127 without issues. Once it completed, both /dev/sda1 and /dev/sdb1 were GPT partitions and actively syncing. POINT D (current): I rebooted again to test if the array would boot and grub failed to load. I booted off of my live thumb drive and found that I can no longer assemble the raid array. mdadm doesn't see the required partitions. -- root@freshdesk /root % uname -a Linux freshdesk 3.0.24-std251-amd64 #2 SMP Sat Mar 17 12:08:55 UTC 2012 x86_64 AMD Athlon(tm) II X4 645 Processor AuthenticAMD GNU/Linux === /proc/partitions and parted look good: root@freshdesk /root % cat /proc/partitions major minor #blocks name 7 0 301788 loop0 8 0 976762584 sda 8 1 732579840 sda1 8 2 244181703 sda2 8 16 732574584 sdb 8 17 732573543 sdb1 8 32 7876607 sdc 8 33 7873349 sdc1 (parted) print all Model: ATA ST31000528AS (scsi) Disk /dev/sda: 1000GB Sector size (logical/physical): 512B/512B Partition Table: gpt Number Start End Size File system Name Flags 1 1049kB 750GB 750GB ext4 2 750GB 1000GB 250GB Linux/Windows data Model: ATA SAMSUNG HD753LJ (scsi) Disk /dev/sdb: 750GB Sector size (logical/physical): 512B/512B Partition Table: gpt Number Start End Size File system Name Flags 1 1049kB 750GB 750GB ext4 Linux RAID raid Model: SanDisk SanDisk Cruzer (scsi) Disk /dev/sdc: 8066MB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 31.7kB 8062MB 8062MB primary fat32 boot, lba === # no sda2, and I double the sdb1 is the one shown in parted root@freshdesk /root % blkid /dev/loop0: TYPE="squashfs" /dev/sda1: UUID="75dd6c2d-f0a8-4302-9da4-792cc7d72355" TYPE="ext4" /dev/sdc1: LABEL="PENDRIVE" UUID="1102-3720" TYPE="vfat" /dev/sdb1: UUID="2dd89f15-65bb-ff88-e368-bf24bd0fce41" TYPE="linux_raid_member" root@freshdesk /root % mdadm -E /dev/sda1 mdadm: No md superblock detected on /dev/sda1. # this is probably a result of me attempting to force the array up, putting superblocks on the GPT partition root@freshdesk /root % mdadm -E /dev/sdb1 /dev/sdb1: Magic : a92b4efc Version : 0.90.00 UUID : 2dd89f15:65bbff88:e368bf24:bd0fce41 Creation Time : Fri Mar 30 19:25:30 2012 Raid Level : raid1 Used Dev Size : 732568320 (698.63 GiB 750.15 GB) Array Size : 732568320 (698.63 GiB 750.15 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 127 Update Time : Sat Mar 31 12:39:38 2012 State : clean Active Devices : 1 Working Devices : 2 Failed Devices : 1 Spare Devices : 1 Checksum : a7d038b3 - correct Events : 20195 Number Major Minor RaidDevice State this 2 8 17 2 spare /dev/sdb1 0 0 8 1 0 active sync /dev/sda1 1 1 0 0 1 faulty removed 2 2 8 17 2 spare /dev/sdb1 === root@freshdesk /root % mdadm -A /dev/md127 /dev/sda1 /dev/sdb1 mdadm: no recogniseable superblock on /dev/sda1 mdadm: /dev/sda1 has no superblock - assembly aborted root@freshdesk /root % mdadm -A /dev/md127 /dev/sdb1 mdadm: cannot open device /dev/sdb1: Device or resource busy mdadm: /dev/sdb1 has no superblock - assembly aborted

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  • set tap0 using virt-manager for bridged wireless

    - by DaveO
    After 3 days I finally have kvm guests working on the network via wireless (link below - thanks!): My network is 192.168.1.0/24 on the host: sudo sh -c "echo 1 > /proc/sys/net/ipv4/ip_forward" sudo tunctl -t tap0 sudo ip link set tap0 up sudo ip addr add 192.168.1.25/24 dev tap0 sudo route add -host 192.168.1.30 dev tap0 sudo parprouted wlan0 tap0 on the guest: auto eth0 iface eth0 inet static address 192.168.1.30 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 gateway 192.168.1.25 and start the guest: sudo kvm /path/to/guest.img -net nic,macaddr=DE:AD:BE:EF:90:26 -net tap,ifname=tap0,script=no This works great and I can ping the local network and the internet back and forth between the guest. But how do I add these settings to the guest's xml config so I can start the guest via virt-manager with the same nic settings? ref: http://www.linuxquestions.org/questions/debian-26/kvm-wireless-bridge-network-691953/

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  • Is there a test to see if hardware virtualization (vmx / svm) are presently enabled within a Linux session?

    - by Dr. Edward Morbius
    I'm writing procedures for configuring VirtualBox support for 64-bit SMP guests, which requires hardware virtualization suppot (VTx/Intel, AMD-V/AMD). I have successfully configured this myself, however I'd like the procedure to be clear. sed -ne '/^flags/s/^.*: //p' /proc/cpuinfo | egrep -q '(vmx|svm)' && echo Has hardware virt || echo No HW virt ... shows if the CPU is capable. I've still got to go enable the feature in BIOS. Any way to test from within Linux to see that this is no or not? Thanks. (Edit: s/xvm/svm/ in title)

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  • High fan speed after return from suspend (on Ubuntu)

    - by Bolo
    Hi, I've got a HP ProBook 5310m laptop with Ubuntu 10.04 (32 bit). When I return from suspend, the fan speed is usually very high: FDTZ sensor reports "90 °C". Yes, the units are wrong, since FDTZ does not report temperature, but fan speed – that's probably just a small bug in reporting. Interestingly, when I plug or unplug the power cable for a moment, the fan speed returns back to normal. My questions: Where can I report this problem? Is it about ACPI support in the kernel? What is the address of the relevant bug tracker? As a workaround for now, how can I programmatically trigger a behavior equivalent to (un)plugging the power cable. More generally, how can I force ACPI to recalculate fan speed? Ideally, I'm looking for something like echo foo > /proc/bar. Thanks in advance!

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  • Killing CLOSE_WAIT sockets without killing parent process on Linux

    - by Alex Neth
    Tomcat is leaving me with CLOSE_WAIT sockets which ultimately saturate the maximum number of connections. I've tried many methods in my client and server code to get rid of these to no avail, including closing connections, calling System.gc(), etc. Now I'm trying to find a way to simply time these out quickly in the OS. I've got conntrack working, but am not sure how to use that to kill these connections. I've also set /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_close_wait to 1, which of course is too low but the connections persist. Is there a way to kill these zombie sockets? Running Ubuntu.

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  • ata error: UnrecovData Handshk

    - by Aaron Digulla
    I just saw this message in my log (openSUSE 11.3, Linux 2.6.36.2): ata6.00: exception Emask 0x10 SAct 0x1 SErr 0x400100 action 0x6 frozen ata6.00: irq_stat 0x08000000, interface fatal error ata6: SError: { UnrecovData Handshk } ata6.00: failed command: WRITE FPDMA QUEUED ata6.00: cmd 61/58:00:9f:69:00/00:00:00:00:00/40 tag 0 ncq 45056 out res 40/00:04:9f:69:00/00:00:00:00:00/40 Emask 0x10 (ATA bus error) ata6.00: status: { DRDY } ata6: hard resetting link ata6: SATA link up 3.0 Gbps (SStatus 123 SControl 300) ata6.00: configured for UDMA/133 ata6: EH complete Two questions: Which disk caused the error? I search /sys and /proc but couldn't find a way to map ata6 to a device (/dev/sdaXY) When such an error happens, does Linux retry the disk operation? Or do I have a corrupt filesystem?

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