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  • When I restart my LXC environment, the container does not re-bind to the IP address

    - by RoboTamer
    The IP does no longer respond to a remote ping With restart I mean: lxc-stop -n vm3 lxc-start -n vm3 -f /etc/lxc/vm3.conf -d -- /etc/network/interfaces auto lo iface lo inet loopback up route add -net 127.0.0.0 netmask 255.0.0.0 dev lo down route add -net 127.0.0.0 netmask 255.0.0.0 dev lo # device: eth0 auto eth0 iface eth0 inet manual auto br0 iface br0 inet static address 192.22.189.58 netmask 255.255.255.248 gateway 192.22.189.57 broadcast 192.22.189.63 bridge_ports eth0 bridge_fd 0 bridge_hello 2 bridge_maxage 12 bridge_stp off post-up ip route add 192.22.189.59 dev br0 post-up ip route add 192.22.189.60 dev br0 post-up ip route add 192.22.189.61 dev br0 post-up ip route add 192.22.189.62 dev br0 -- /etc/lxc/vm3.conf lxc.utsname = vm3 lxc.rootfs = /var/lib/lxc/vm3/rootfs lxc.tty = 4 #lxc.pts = 1024 # pseudo tty instance for strict isolation lxc.network.type = veth lxc.network.flags = up lxc.network.link = br0 lxc.network.name = eth0 lxc.network.mtu = 1500 #lxc.cgroup.cpuset.cpus = 0 # security parameter lxc.cgroup.devices.deny = a # Deny all access to devices lxc.cgroup.devices.allow = c 1:3 rwm # dev/null lxc.cgroup.devices.allow = c 1:5 rwm # dev/zero lxc.cgroup.devices.allow = c 5:1 rwm # dev/console lxc.cgroup.devices.allow = c 5:0 rwm # dev/tty lxc.cgroup.devices.allow = c 4:0 rwm # dev/tty0 lxc.cgroup.devices.allow = c 4:1 rwm # dev/tty1 lxc.cgroup.devices.allow = c 4:2 rwm # dev/tty2 lxc.cgroup.devices.allow = c 1:9 rwm # dev/urandon lxc.cgroup.devices.allow = c 1:8 rwm # dev/random lxc.cgroup.devices.allow = c 136:* rwm # dev/pts/* lxc.cgroup.devices.allow = c 5:2 rwm # dev/pts/ptmx lxc.cgroup.devices.allow = c 254:0 rwm # rtc # mounts point lxc.mount.entry=proc /var/lib/lxc/vm3/rootfs/proc proc nodev,noexec,nosuid 0 0 lxc.mount.entry=devpts /var/lib/lxc/vm3/rootfs/dev/pts devpts defaults 0 0 lxc.mount.entry=sysfs /var/lib/lxc/vm3/rootfs/sys sysfs defaults 0 0

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  • mod_cache not working

    - by Pistos
    I have a PHP site that has many dynamically generated pages. I'm trying to turn to mod_cache to help boost performance, because in most cases, content does not change in a given day. I have configured mod_cache as best I could, following examples around the web, including the mod_cache page on apache.org. When I set LogLevel debug, I see a bit of information about the caching that is [not] happening. There are plenty of pairs of lines like this: [Fri Jun 01 17:28:18 2012] [debug] mod_cache.c(141): Adding CACHE_SAVE filter for /foo/bar [Fri Jun 01 17:28:18 2012] [debug] mod_cache.c(148): Adding CACHE_REMOVE_URL filter for /foo/bar Which is fine, because I've set CacheEnable disk /foo, to indicate that I want everything under /foo cached. I'm new to mod_cache, but my understanding about these lines is that it just means that mod_cache has acknowledged that the URL is supposed to be cached, but there are supposed to be more lines indicating that it is saving the data to cache, and then later retrieving them on subsequent hits to the same URL. I can hit the same URL till I'm blue in the face, whether with F5 refreshing, or not, or with different browsers, or different computers. It's always that pair of lines that shows in the logs, and nothing else. When I set CacheEnable disk /, then I see more activity. But I don't want to cache the entire site, and there are many, many different subpaths to the site, so I don't want to have to modify code to set no-cache headers in all the necessary places. I'll mention that mod_rewrite is in use here, rewriting /foo/bar to something like index.php?baz=/foo/bar, but my understanding is that mod_cache uses the pre-rewrite URL, not the post-rewrite URL. As far as I can tell, I have the response headers not getting in the way of caching. Here's an example from one hit: Cache-Control:must-revalidate, max-age=3600 Connection:Keep-Alive Content-Encoding:gzip Content-Length:16790 Content-Type:text/html Date:Fri, 01 Jun 2012 21:43:09 GMT Expires:Fri, 1 Jun 2012 18:43:09 -0400 Keep-Alive:timeout=15, max=100 Pragma: Server:Apache Vary:Accept-Encoding mod_cache config is as follows: CacheRoot /var/cache/apache2/ CacheDirLevels 3 CacheDirLength 2 CacheEnable disk /foo What is getting in the way of mod_cache doing its job of caching?

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  • Mail to Mailenable group sometimes bounces back because it cannot find one of the group members

    - by Stanley
    I am using MailEnable Enterprise Edition 6.53. On one of my PostOffices I have a group address set up with 5 members in the group. Under normal circumstances when someone sends a mail to this group then the mail gets successfully forwarded to all 5 members in the group. However, every now and then when a recipient sends to the group they get a bounce back message from us that the mail could not be delivered because one of the user's addresses was not found on the server. This could happen for any one of the 5 users in the group. The error message looks like: Message could not be delivered. Error was: The email address is not available on this system The following recipient(s) could not be reached: [SF:mydomain.com/my_username] What could be causing this and how do I fix it? Obviously the mailbox DOES exist as, under normal circumstances, when someone mails the group the mail gets delivered successfully and forwarded to all group members. All the mailboxes most definitely DO exist on the system. EDIT: I have done more investigation and I see an error in Windows Event Viewer: MailEnable Database Provider error: 0 FAILURE: (SQLDriverConnect), Module: MEIMAPS.exe; Error: [Microsoft][ODBC SQL Server Driver]Timeout expired This seems to be related to http://forum.mailenable.com/viewtopic.php?p=53157 and http://www.mailenable.com/kb/content/view.asp?ID=ME020535 but the setups in these links use MySQL as a database whereas we use SQL Server. Maybe this shines some new light on the problem?

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  • Debian DNSSEC - howto secure a domain?

    - by Daniel Marschall
    I have a beginner question about DNSSEC. I have much experience with TLS and cryptography-stuff and would like to try out this new technology. I have googled very much about this but I haven't found useful information for me. I think one confusion in information gathering is that "Debian howto DNSSEC setup" can mean "How to USE DNSSEC for resolving" OR "How to secure your domain with DNSSEC". I am searching the second. I am running a Debian Squeeze server with root privileges which has a domain name ending with ".de" (which is already signed by the root zone). The network interface at this server uses the gateway IP (DNS resolver?) of the datacentre the server is running on. My domain is hosted at freedns.afraid.org , where I can add DNS RRs for my domain. They are currently NOT capable of adding DNSSEC RRs, but I am bugging them to support this soon. ;-) My simple question is: How do I setup DNSSEC on Debian? Resp. who have I ask to? As far as I understand, all I have to do is to run dnssec-keygen on my Debian server and then add the key to my DNS-provider as DNSSEC RR. (And change it every 30 days?) I have looked at this http://www.isc.org/files/DNSSEC_in_6_minutes.pdf but it looks like you have to be the owner of a ZONE, so I don't think this applies to me. Who needs to sign my domain? My DNS-provider or my zone (DeNIC) or can I do it myself? Any help is very appreciated!

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  • Getting some French-Canadian keyboard strokes to work on English keyboard

    - by Gradient
    I'm trying to use some of the French-Canadian keyboard stokes I'm used to on an English keyboard. I would like to change the behaviour of some keys. I was able to implement these changes in Vim, but I would like them to be applied system-wide (for Windows and Ubuntu). Here's what I want to implement : If I press [a, the character printed is â. When I press [r, something that's supposed to stay normal, the characters printed are [r. If I hold [ for 3 seconds, [ is printed. I want this delay to be applied to all my modified keys. I want to map < to ' and the characters 'e to è. The complex problem here is that I only want the ' beside the ; key to produce the è character, NOT when I press the < (remapped to ') then e. I'll show you a .vimrc file that implements this, now I want this behavior system-wide: set timeout timeoutlen=3000 ttimeoutlen=100 inoremap [a â inoremap [A Â inoremap [e ê inoremap [E Ê inoremap [i î inoremap [I Î inoremap [o ô inoremap [O Ô inoremap [u û inoremap [U Û inoremap 'a à inoremap 'A À inoremap 'e è inoremap 'E È inoremap 'u ù inoremap 'U Ù inoremap }e ë inoremap }E Ë inoremap }i ï inoremap }I Ï inoremap }u ü inoremap }U Ü inoremap ]c ç inoremap ]C Ç inoremap / é inoremap < '

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  • How to set minimum SQL Server resource allocation for a database?

    - by Jeff Widmer
    Over the past Christmas holiday week, when the website I work on was experiencing very low traffic, we saw several Request timed out exceptions (one on each day 12/26, 12/28, 12/29, and 12/30) on several pages that require user authentication. We rarely saw Request timed out exceptions prior to this very low traffic week. We believe the timeouts were due to the database that it uses being "spun down" on the SQL Server and taking longer to spin up when a request came in. There are 2 databases on the SQL Server (SQL Server 2005), one which is specifically for this application and the other for the public facing website and for authentication; so in the case where users were not logged into the application (which definitely could have been for several hours at a time over Christmas week) the application database probably received no requests. We think at this point SQL Server reallocated resources to the other database and then when a request came in, extra time was needed to spin up the application database and the timeout occurred. Is there a way to tell SQL Server to give a minimum amount of resources to a database at all times?

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  • Blinking power button

    - by Mike Ramsey
    A friend asked me to look at his Gateway DX4640 desktop. When he presses the power button, power goes to the mobo (NVIDIA nForce 630i MCP73PV, GeForce 7100 chipset) and the CPU fan starts spinning. The power button slowely blinks on and off (blue) and the screen briefly says no signal and then goes black. And nothing else; no post code beeps. My initial two conjectures were: 1. Vista was stuck in sleep/hibernation mode, or 2. A power off had left the mobo in a bad state. The fix for both is to: a) Unplug the AC power cord b) hold the power button for 30 second to fully discharge the mobo It didn't help. I left the system unplugged from AC power for an hour. No change. I am out of ideas. Has anybody seen anything like this before? What does a blinking blue power button mean? How can I get more data points to guide trouble shooting? --Thank you, --Mike

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  • Why won't dhclient use the static IP I'm telling it to request?

    - by mike
    Here's my /etc/dhcp3/dhclient.conf: request subnet-mask, broadcast-address, time-offset, routers, domain-name, domain-name-servers, domain-search, host-name, netbios-name-servers, netbios-scope, interface-mtu; timeout 60; reject 192.168.1.27; alias { interface "eth0"; fixed-address 192.168.1.222; } lease { interface "eth0"; fixed-address 192.168.1.222; option subnet-mask 255.255.255.0; option broadcast-address 255.255.255.255; option routers 192.168.1.254; option domain-name-servers 192.168.1.254; } When I run "dhclient eth0", I get this: There is already a pid file /var/run/dhclient.pid with pid 6511 killed old client process, removed PID file Internet Systems Consortium DHCP Client V3.1.1 Copyright 2004-2008 Internet Systems Consortium. All rights reserved. For info, please visit http://www.isc.org/sw/dhcp/ wmaster0: unknown hardware address type 801 wmaster0: unknown hardware address type 801 Listening on LPF/eth0/00:1c:25:97:82:20 Sending on LPF/eth0/00:1c:25:97:82:20 Sending on Socket/fallback DHCPREQUEST of 192.168.1.27 on eth0 to 255.255.255.255 port 67 DHCPACK of 192.168.1.27 from 192.168.1.254 bound to 192.168.1.27 -- renewal in 1468 seconds. I used strace to make sure that dhclient really is reading that conf file. Why isn't it paying attention to my "reject 192.168.1.27" and "fixed-address 192.168.1.222" lines?

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  • apache2 + mod_fastcgi + suexec + php5.2 = unstable on high load

    I am hosting several (~30) different sites on one server with apache2+fastcgi+suexec+php5. Sites have different loads and different execution times of their scripts (some of them process request for 5-7 seconds, some <1sek). Sometimes when single site receives very high load (all php instances of this site are created and used) - whole apache server hangs. Apache (worker mpm) creates new processes up to the upper limit. It looks like it is starting to queue ALL new request for EVERY site, not only the one that has high load and quickly achieves process limits... restart of apache solves the problem... config: FastCgiConfig -singleThreshold 1 -multiThreshold 10 -listen-queue-depth 30 -maxProcesses 80 -maxClassProcesses 12 -idle-timeout 30 -pass-header HTTP_AUTHORIZATION -pass-header If-Modified-Since -pass-header If-None-Match (earlier have default -listen-queue-depth = 100, but it didn't change anything...) Any suggestions? Another question - how is implemented this listen queue? is it one queue for whole apache, or unique queue for every defined php apllication (suexec site)? I would like to achieve something like this: when one site receives high load and its queue is full - server bounces next request, but only for this one site.. Other sites should work properly...

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  • Forcing a particular SSL protocol for an nginx proxying server

    - by vitch
    I am developing an application against a remote https web service. While developing I need to proxy requests from my local development server (running nginx on ubuntu) to the remote https web server. Here is the relevant nginx config: server { server_name project.dev; listen 443; ssl on; ssl_certificate /etc/nginx/ssl/server.crt; ssl_certificate_key /etc/nginx/ssl/server.key; location / { proxy_pass https://remote.server.com; proxy_set_header Host remote.server.com; proxy_redirect off; } } The problem is that the remote HTTPS server can only accept connections over SSLv3 as can be seen from the following openssl calls. Not working: $ openssl s_client -connect remote.server.com:443 CONNECTED(00000003) 139849073899168:error:140790E5:SSL routines:SSL23_WRITE:ssl handshake failure:s23_lib.c:177: --- no peer certificate available --- No client certificate CA names sent --- SSL handshake has read 0 bytes and written 226 bytes --- New, (NONE), Cipher is (NONE) Secure Renegotiation IS NOT supported Compression: NONE Expansion: NONE --- Working: $ openssl s_client -connect remote.server.com:443 -ssl3 CONNECTED(00000003) <snip> --- SSL handshake has read 1562 bytes and written 359 bytes --- New, TLSv1/SSLv3, Cipher is RC4-SHA Server public key is 1024 bit Secure Renegotiation IS NOT supported Compression: NONE Expansion: NONE SSL-Session: Protocol : SSLv3 Cipher : RC4-SHA <snip> With the current setup my nginx proxy gives a 502 Bad Gateway when I connect to it in a browser. Enabling debug in the error log I can see the message: [info] 1451#0: *16 peer closed connection in SSL handshake while SSL handshaking to upstream. I tried adding ssl_protocols SSLv3; to the nginx configuration but that didn't help. Does anyone know how I can set this up to work correctly?

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  • Restarting shell script with &disown using Monit

    - by Solas Admin
    I have a shell script that runs a C++ backend mail system (PluginHandler). I need to monitor this process in Monit and restart it if it fails. The script: export LD_LIBRARY_PATH=/usr/local/lib/:/CONFIDENTAL/CONFIDENTAL/Common/ cd PluginHandler/ ./PluginHandler This script does not have a PID file and we run this script by executing ./rundaemon.sh &disown ./pluginhandler starts the process and starts logging into /etc/output/output.log I stop the process by identifying the process ID with [ps -f | grep PluginHandler] and then killing the process. I can check the process in Monit just fine, but I think Monit is starting the process if it is not running but it can't do &disown so the process ends as soon as it starts. This is the code in the monitrc file for checking this process: check process Backend matching "PluginHandler" if not exist then alert start "PATH/TO/SCRIPT/rundaemon.sh &disown" alert [email protected] only on {timeout} with mail-format {subject: "[BLAH"} I tried to stop the script from terminating by modifying the script like the following but this does not work either. export LD_LIBRARY_PATH=/usr/local/lib/:/home/CONFIDENTAL/production/CONFIDENTAL/Common/ cd PluginHandler/ (nohup ./PluginHandler &) return Any help to write a proper Monit rules to resolve this issue would be greatly appreciated :)

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  • CentOS 5.5 remote kickstart installation stalls at "Starting install process." How to debug?

    - by ewwhite
    Hello, I'm having a difficult time with a remote CentOS 5.5 kickstart installation on an HP ProLiant DL360 G6. This is in an environment where I maintain an internal CentOS yum repository. The kickstart installation and post scripts have been tested and normally work. This hardware is also common in this environment, so I do not believe that it is a factor. Unfortunately, I'm having problems with a specific server install. The system is remote to the yum repository at a distance of 500 miles. They are connected over a private low-latency 100-megabit layer 2 connection (26ms round-trip). I'm mounting the 10mb CentOS 5 netinstall ISO image via an HP ILO remote console. The initial boot parameters are: linux ks=http://yum.abctrading.com/prop.cfg ksdevice=eth0 ip=x.x.x.x dns=x.x.x.x netmask=255.255.255.0 gateway=x.x.x.x I'm using the url --url http://ks.abctrading.com/5.5/os/x86_64/ method of installation. This quickly boots into the anaconda installer, pulls the kickstart config and formats the drives. The process eventually halts at the screen below, reading "Starting install process.". Going to the other virtual consoles give the second image below. The process stalls at this point and cannot proceed with the rest of the installation. Running the same kickstart config locally works just fine. I've tried mounting the boot ISO from the console as well as from the ILO2 command line pointing to a locally-hosted boot ISO via http. How can I debug this? Are there any options I've overlooked?

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  • PHP crashing during oAuth scripts

    - by FunkyChicken
    I just installed Nginx 1.2.4 and PHP 5.4.0 (from svn) (php fpm). CentOs 5.8 64 The problem I have is that PHP crashes the moment I run any social oAuth scripts. I have tried to log into Facebook, Twitter and Google with various scripts that I know work on my other servers. When I load the scripts I get a 502 error from Nginx. And I find these errors in the log: in php-fpm log: WARNING: [pool www] child 23821 exited on signal 11 (SIGSEGV) after 1132.862984 seconds from start in nginx log: ERROR: recv() failed (104: Connection reset by peer) while reading response header from upstream From what I can see, it goes wrong when PHP tries to make a request to any of the oAuth servers. https://github.com/mahmudahsan/PHP-SDK-3.0---Graph-API-base-Facebook-Connect-Tutorial-Source for example is one of the scripts that works perfectly on my other machines, but causes PHP to crash. I found: http://stackoverflow.com/questions/3616191/nginx-php-fpm-502-bad-gateway which seems to be a similar problem, but I cannot find a way to solve it. +++ UPDATE +++ Now I have been doing some debugging in 1 of the scripts that is playing up. If you go to line 808 http://pastebin.com/gSnzRtXb it runs the curl_exec() command. When that is ran, it crashes. If i echo'test';exit; just above that line, it echo's correctly, if i do it below that line, php crashes. Which means it's that line 808 which causes the crash. So I made a very simple script to do some testing: http://pastebin.com/Rshnyhcm which also uses curl_exec, but that runs just fine. So I started to dig deeper into that query from the facebook script to see what values the $opts array contains from line 806. Output of that array is: http://pastebin.com/Cq9ffd3R What the problem is, I still have no clue :(

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  • Unable to Access Certain Websites

    - by codejoust
    Through a local network, all computers except one ubuntu machine can access 1. Adobe.com 2. Icann.org 3. Apache.org 4. Example.com. The ubuntu machine returns (in firefox): "Though the site seems valid, the browser was unable to establish a connection." Furthermore, when I traceroute those websites using the ubuntu machine, they all return ubuntu.local, and it ends there: (traceroute to icann.org (192.0.32.7), 30 hops max, 40 byte packets 1 ubuntu.local (192.168.1.105) 3000.791 ms !H 3000.808 ms !H 3000.814 ms !H I've checked the hosts file, and there isn't anything in there, and I have an apache server there so if it was redirected to localhost, I'd probably see the localhost webroot page. Thanks in advance! user@ubuntu:~$ netstat -nr Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1 192.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 eth1 0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth1 The Ubuntu Machine is one of six on the network. I'm using opendns for dns, so I do think that should be a problem.

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  • One Active Directory, Multiple Remote Desktop Services (Server 2012 solution)

    - by Trinitrotoluene
    What I am trying to do is quite complex, so I figured I'd throw it out to a wider audience to see if anyone can find a flaw. What I am trying to do (as an MSP/VAR) is design a solution that will give multiple companies a session based remote desktop (companies that need to be kept completely seperate), using only a handful of servers. This is how I imagine it at the moment: CORE SERVER - Server 2012 Datacentre (All below are HyperV servers) Server1: Cloud-DC01 (Active Directory Domain Services for mycloud.local) Server2: Cloud-EX01 (Exchange Server 2010 running multi tenant mode) Server3: Cloud-SG01 (Remote Desktop Gateway) CORE SERVER 2 - Server 2012 Datacentre (All below are HyperV servers) Server1: Cloud-DC02 (Active Directory Domain Services for mycloud.local) Server2: Cloud-TS01 (Remote Desktop Session Host for Company A) Server3: Cloud-TS02 (Remote Desktop Session Host for Company B) Server4: Cloud-TS03 (Remote Desktop Session Host for Company C) What I thought about doing was setting up each Organisation in their own OU (perhaps creating their OU structure based on the Excahnge 2010 tenant OU structure so the accounts are linked). Each company would get a Remote Desktop Session Host server that would also serve as a file server. This server would be seperated from the rest on its own range. The server Cloud-SG01 would have access to all these networks and route the traffic to the appropriate network when a client connects and authenticated so they are pushed onto the correct server (Based on session collections in 2012). I won't lie this is something I have come up with quite quickly so there may well be something gapingly obvious that I am missing. Any feedback would be appreciated.

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  • virtualisation with kvm: export services from guest to the host

    - by ascobol
    Hello, I would like to export some services from the guest os to the host os, via kvm, and by the same way learn some things about networking. I have tried the following commands: In the host (kubuntu 10.4): $ sudo tunctl -u ascobol Set 'tap0' persistent and owned by uid 2401 $ sudo ifconfig tap0 192.168.2.1 netmask 255.255.255.0 broadcast 192.168.2.255 The ifconfig command returns: $ /sbin/ifconfig tap0 Link encap:Ethernet HWaddr 3e:4e:e3:cc:bc:92 inet addr:192.168.2.1 Bcast:192.168.2.255 Mask:255.255.255.0 inet6 addr: fe80::3c4e:e3ff:fecc:bc92/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:17 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) $ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.2.0 0.0.0.0 255.255.255.0 U 0 0 0 tap0 Then I run the virtual machine (ubuntu server 10.4): $ sudo kvm -hda ubuntuserver104.qcow2 -net nic -net tap,name=tap0,script=no (I'm using sudo because without it fails with the following message:) warning: could not configure /dev/net/tun: no virtual network emulation With sudo the virtual machine boots, I just get this message: pci_add_option_rom: failed to find romfile "pxe-rtl8139.bin" In the virtual machine: $ ifconfig eth0 192.168.2.2 netmask 255.255.255.0 broadcast 192.168.2.255 Now if I run: $ ssh 192.168.2.2 I just get a No route to host What is wrong with this setup ? Thanks !

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  • IPv6 Routing / Subnetting

    - by nappo
    Recently I have installed Citrix Xen Server 6.2 on a machine. My Provider (Hetzner) gave me the IPv6 Subnet 2a01:4f8:200:xxxx::/64. Followed an article in the providers wiki (1) i got it working and can assign IPs to my guests (CentOS). However i can't assign a second IP to a single guest - it will result in a timeout. I'm not very familiar with IPv6 routing / subnetting - any help or tips for further troubleshooting is welcome! My Setup: XenServer 6.2 IPv6: 2a01:4f8:200:xxxx::2/112 ip -6 route: 2a01:4f8:200:xxxx::/112 dev xenbr0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0 fe80::1 dev xenbr0 metric 1024 mtu 1500 advmss 1440 hoplimit 0 default via fe80::1 dev xenbr0 metric 1024 mtu 1500 advmss 1440 hoplimit 0 Guest 1 IPv6: 2a01:4f8:200:xxxx::3/64 IPv6: 2a01:4f8:200:xxxx::4/64 ip -6 route: 2a01:4f8:200:xxxx::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 default via fe80::1 dev eth0 metric 1 mtu 1500 advmss 1440 hoplimit 4294967295 Guest 2 IPv6: 2a01:4f8:200:xxxx::5/64 Guest 1 IPv6 is working fine, Guest 2 too. As suggested by the wiki article (1) i split my /64 network into a /112. Is it right to set the host /112 and the guests /64? Why is that?

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  • Inconsistent DHCP replies with Windows 2008R2 DHCP server

    - by verbalicious
    I've got a Windows 2008R2 standard server running DHCP services. We've noticed that certain clients are receiving inconsistent DHCP replies. We have over 175 Windows workstations in this VLAN that don't seem to have trouble getting DHCP leases. However, PXE-booting clients trying to reach our DHCP server are able to get a lease inconsistently. Additionally, we tried using the "dhcping" tool against our DHCP server and found that roughly two of every three requests time out with "no answer" -- and this holds true when we set the timeout value on dhcping to 20seconds. After a failed attempt, however, we may get a dhcp lease reply immediately with dhcping. This leads me to believe that this issue isn't confined to PXE booting clients, but something more systemic with my LAN layer2 or DHCP. And that possibly my 175 windows clients are experiencing this in some form without my knowledge. We have over 30% of our scope available so the addresses are there. I was unable to find anything in the Windows server "DHCP-Server" log. Of course, my goal is to have my DHCP server reply to every request that it receives on the LAN!

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  • PHP-FPM issue on LEMP Stack and WordPress

    - by jw60660
    I'm very much a NGINX and Server Admin beginner. I used this tutorial to install NGINX / PHP / mySQL / WordPress: C3M Digital Tutorial In this tutorial the backend php-cgi setup is configured using fastcgi. php5-fpm was installed during this tutorial: apt-get install nginx-full php5-fpm php5 php5-mysql php5-apc php5-mysql php5-xsl php5-xmlrpc php5-sqlite php5-snmp php5-curl After reading that the NGINX configuration on the WordPress codec was more secure than most tutorials, I decided to use the codex configuration: WordPress NGINX configuration in Codex The Codex configuration uses php-fpm for backend php-cgi. When opening the browser I got a 502 Bad Gateway error. The error log was: "2012/06/10 21:18:27 [crit] 14009#0: *4 connect() to unix:/tmp/php-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 12.3.456.789, server: mywebsite.com, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/tmp/php-fpm.sock:", hos t: "mywebsite.com"" In the main NGINX configuration file supplied by the codex I noticed the line starting "server unix:" in the upstream php block which point to the empty directory: # Upstream to abstract backend connection(s) for PHP. upstream php { server unix:/tmp/php-fpm.sock; # server 127.0.0.1:9000; } I checked the folder at /tmp and it was empty. Seems I missed configuring php-fpm to play with NGINX. Can someone point me in the right direction? Much appreciated!

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  • 100% iowait + drive faults in dmesg

    - by w00t
    Hi, I have a server on which resides a fairly visited web app. It has a raid1 of 2 HDDs, 64MB Buffer, 7200 RPM. Today it started throwing out errors like: kernel: ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen kernel: ata2.00: cmd b0/d0:01:00:4f:c2/00:00:00:00:00/00 tag 0 pio 512 in kernel: res 40/00:00:00:4f:c2/00:00:00:00:00/00 Emask 0x4 (timeout) kernel: ata2.00: status: { DRDY } kernel: ata2: hard resetting link kernel: ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300) kernel: ata2.00: max_sectors limited to 256 for NCQ kernel: ata2.00: max_sectors limited to 256 for NCQ kernel: ata2.00: configured for UDMA/133 kernel: sd 1:0:0:0: timing out command, waited 7s kernel: ata2: EH complete kernel: SCSI device sda: 976773168 512-byte hdwr sectors (500108 MB) kernel: sda: Write Protect is off kernel: SCSI device sda: drive cache: write back All day long it has been in load higher than 10-15. I am monitoring it with atop and it gives some bizarre readings: DSK | sda | busy 100% | read 2 | write 208 | KiB/r 16 | KiB/w 32 | MBr/s 0.00 | MBw/s 0.65 | avq 86.17 | avio 47.6 ms | DSK | sdb | busy 1% | read 10 | write 117 | KiB/r 17 | KiB/w 5 | MBr/s 0.02 | MBw/s 0.07 | avq 4.86 | avio 1.04 ms | I frankly don't understand why only sda is taking all the hit. I do have one process that is constantly writing with 1-2megs but what the hell.. 100% iowait?

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  • Rsync Push files from linux to windoes. ssh issue - connection refused

    - by piyush c
    For some reason I want to run a script to move files from Linux machine to Windows. I have installed cwRsync on my windows machine and able to connect to linux machine. When i execute following command: rsync -e "ssh -l "piyush"" -Wgovz --timeout 120 --delay-updates --remove-sent-files /usr/local/src/piyush/sync/* "[email protected]:/cygdrive/d/temp" Where 10.0.0.60 is my widows machine and I am running above command on Linux - CentOS 5.5. After running command I get following error message: ssh: connect to host 10.0.0.60 port 22: Connection refused rsync: connection unexpectedly closed (0 bytes received so far) [sender] rsync error: error in rsync protocol data stream (code 12) at io.c(463) [sender=2.6.8] [root@localhost sync]# ssh [email protected] ssh: connect to host 10.0.0.60 port 22: Connection refused I have modified my firewall settings on widows to allow all ports. I think this issue is due to SSH Daemon not present on my windows machine. So I tried installing OpenSSH on my machine and running ssh-agent but didn't helped. I tried similar command to run on my widows machine to pull files from Linux and its working fine. For some reason I want command for Linux machine so that I can embed it in a shell script. Can you suggest me if I am missing anything.

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  • iptables advanced routing

    - by Shamanu4
    I have a Centos server acting as a NAT in my network. This server has one external (later ext1) interface and three internal (later int1, int2 and int3). Egress traffic comes from users via int1 and after MASQUERADE goes via ext1. Ingress traffic comes from ext1, MASQUERADE, and goes via int2 or int3 according to static routes. | ext1 | x.x.x.x/24 +---------|----------------------+ | | | Centos server (NAT) | | | +---|------|---------------|-----+ | | | int1 | | int2 | int3 10.30.1.10/24 | | 10.30.2.10/24 | 10.30.3.10/24 ^ v v 10.30.1.1/24 | | 10.30.2.1/24 | 10.30.3.1/24 +---|------|---------------|-----+ | | | | | | | v v | | ^ -Traffic policer- | | |_____________ | | | | | +------------------|-------------+ | 192.168.0.1/16 | | Clients 192.168.0.0/16 The problem: Egress traffic seems to be dropped after PREROUTING table. Packet counters are not changing on MASQUERADE rule in POSTROUTING. If I change the routes to clients causing the traffic go back via int1 - everything works perfectly. current iptable configuration is very simple: # cat /etc/sysconfig/iptables *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -I INPUT 1 -i int1 -j ACCEPT -A FORWARD -j ACCEPT COMMIT *nat -A POSTROUTING -o ext1 -j MASQUERADE # COMMIT Can anyone point me what I'm missing? Thanks. UPDATE: 192.168.100.60 via 10.30.2.1 dev int2 proto zebra # routes to clients ... 192.168.100.61 via 10.30.3.1 dev int3 proto zebra # ... I have a lot of them x.x.x.0/24 dev ext1 proto kernel scope link src x.x.x.x 10.30.1.0/24 dev int1 proto kernel scope link src 10.30.1.10 10.30.2.0/24 dev int2 proto kernel scope link src 10.30.2.10 10.30.3.0/24 dev int3 proto kernel scope link src 10.30.3.10 169.254.0.0/16 dev ext1 scope link metric 1003 169.254.0.0/16 dev int1 scope link metric 1004 169.254.0.0/16 dev int2 scope link metric 1005 169.254.0.0/16 dev int3 scope link metric 1006 blackhole 192.168.0.0/16 default via x.x.x.y dev ext1 Clients have 192.168.0.1 as gateway, which is redirecting them to 10.30.1.1

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  • Xen PV packet loss

    - by Delphinator
    I'm having some serious issues with packetloss with one of my servers. This server is a somewhat old (P4-era) machine running Debian Squeeze and Xen 4.0. There are two domUs running on it (both also Debian Squeeze), one gateway and a fileserver. Unfortunatly the processor has no virtualization extensions, therefore only PV can be used. While investigating why our network seems to be slower than it should I found some pretty bad packet loss (~25%). After further investigation and several experiments I did a measurment between the dom0 and one of the domUs: Server listening on UDP port 5001 Receiving 1470 byte datagrams UDP buffer size: 110 KByte (default) ------------------------------------------------------------ ------------------------------------------------------------ Client connecting to dom0, UDP port 5001 Sending 1470 byte datagrams UDP buffer size: 110 KByte (default) ------------------------------------------------------------ [ 3] local 192.168.1.2(domU) port 33817 connected with 192.168.1.100(dom0) port 5001 [ 4] local 192.168.1.2(domU) port 5001 connected with 192.168.1.100(dom0) port 48606 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 46.3 MBytes 38.7 Mbits/sec [ 3] Sent 33020 datagrams [ 3] Server Report: [ 3] 0.0-10.0 sec 46.2 MBytes 38.6 Mbits/sec 0.030 ms 89/33019 (0.27%) [ 3] 0.0-10.0 sec 1 datagrams received out-of-order [ 4] 0.0-10.2 sec 43.0 MBytes 35.3 Mbits/sec 13.074 ms 11575/42256 (27%) tl;dr: 27% packet loss from dom0 to domU with 50Mbit UDP packets. Same thing happens from anywhere in the network. The problem gets better for smaller bandwidths (0.047% for 5Mbit) and worse for higher (59% for 200Mbit) ones. I did increase the CPU-weight of the dom0, there is no swapping going on, and actual networking-hardware is not involved. I never expected Xen (or anything related) to drop packets, and I'm completly clueless what to try next.

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  • Error creating ODBC connection to SQL Server 2008 Express

    - by DavidB
    When creating a System DSN, I get the error: Connection failed: SQLState: '08001' SQL Server Error: 2 [Microsoft][SQL Server Native Client 10.0]Named Pipes Provider: Could not open a connection to SQL Server [2]. Connection failed: SQLState: 'HYT00' SQL Server Error: 0 [Microsoft][SQL Server Native Client 10.0]Login timeout expired I'm running Vista Home Premium 64-bit SP2, and installed SQL Server 2008 Express Advanced without errors. I'll be using the database locally for an app installed on the same PC. I'm able to successfully connect with SQL Server Management Studio using Windows Authentication (my Windows account is a member of local Administrators), and I can successfully create a database with default ownership (defaults to my Windows account). SQL Server Configuration Manager shows that Shared Memory, TCP/IP, and Named Pipes are enabled for SQL Native Client 10.0 Configuration, SQL Native Client 10.0 Configuration (32bit), and SQL Server Network Configuration (SQLEXPRESS). The SQL Server (SQLEXPRESS) and SQL Server Reporting Services (SQLEXPRESS) services are running. When I create a system DSN, my driver choices are SQL server (sqlsrv32.dll 4-10-09), which gives a generic wizard, and SQL Server Native Client 10.0 (sqlncli10.dll 7-10-08), which gives the SQL Server 2008 wizard. I choose the latter. I enter name, description, and have tried both MyPCName and 127.0.0.1 for the server name (browsing turns up nothing). After clicking Next, I leave it at Integrated Windows authentication, and leave Connect to server for additional options checked. After clicking Next, I get the error above. I know it's probably a simple answer, (permission issue?) and I'm a SQL noob, so I appreciate anything that would point me in the right direction. Thanks!

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  • Balancing internal services using a Cisco CSS 11501

    - by Ladadadada
    First, the background to the problem: I have a Cisco CSS11501 that I am using to load balance a few web servers. These web servers have two network interfaces, one internal and one external and we are sending the requests to the internal interface. We have the CSS configured to do NAT because our webservers need to see the client's IP address. Because the TCP packets hit the webservers with a source address on the Internet, the webserver tries to send the packet back to the client over the external interface and not through the load balancer. In order to stop these requests being sent back out to the Internet via the external interface, we added a routing rule on these boxes so that all traffic with a source address on the internet will use the load balancer as the gateway. This part works fine. What I would also like to to is use the CSS as a load balancer for internal services such as our MySQL slaves. When I do this, I run into a similar problem; the TCP connection goes from the web server to the load balancer and then from the load balancer to the MySQL slave but the CSS spoofs a source address of the original webserver. The MySQL slave then tries to send the response directly to the webserver via the internal network and not via the load balancer. The ideal solution would be to tell the CSS not to do source address spoofing on the internal network and only do it for requests originating on the Internet. Is this possible ? Failing that, is there a way of directing the load balanced traffic back through the load balancer while keeping the other traffic (say SSH) purely on the internal network ? Is there another way of using the CSS11501 to load balance internal services ?

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