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  • Can't Install php5-dev on Ubuntu 12.04 running OpenVZ

    - by MEsch
    I'm trying to fetch the php apc package using pecl and running into a problem that I believe may be caused by OpenVZ. To do so I need php5-dev. When I try to install it via apt-get, I get this: php5-dev : Depends: libssl-dev but it is not going to be installed Depends: libtool (>= 2.2) but it is not going to be installed As I try to manually install dependencies (without success), I believe I've identified libc6-dev as the culprit. libc6-dev : Depends: libc6 (= 2.15-0ubuntu10.2) but 2.15-0ubuntu10+openvz0 is to be installed I have libc6 installed on the system. If it's any help here is my sources.list: deb http://archive.ubuntu.com/ubuntu precise main restricted universe deb http://archive.ubuntu.com/ubuntu precise-updates main restricted universe deb http://security.ubuntu.com/ubuntu precise-security main restricted universe multiverse deb http://archive.canonical.com/ubuntu precise partner This is a very frustrating problem, as I have other instances of Ubuntu 12.04 running just fine elsewhere (though not on OpenVZ).

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  • Turn off gzip for a location in Nginx

    - by Nyxynyx
    How can gzip be turned off for a particular location and all its sub-directories? My main site is at http://mydomain.com and I want to turn gzip off for both http://mydomain.com/foo and http://mydomain.com/foo/bar. gzip is turned on in nginx.conf. I tried turning off gzip as shown below, but the Response Headers in Chrome's dev tools shows that Content-Encoding:gzip. How should gzip/output buffering be disabled properly? Attempt: server { listen 80; server_name www.mydomain.com mydomain.com; access_log /var/log/nginx/access.log; error_log /var/log/nginx/error.log; root /var/www/mydomain/public; index index.php index.html; location / { gzip on; try_files $uri $uri/ /index.php?$args ; } location ~ \.php$ { fastcgi_pass unix:/var/run/php5-fpm.sock; fastcgi_index index.php; include fastcgi_params; fastcgi_read_timeout 300; } location /foo/ { gzip off; try_files $uri $uri/ /index.php?$args ; } }

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  • How does Linux determine the SCSI address of a disk?

    - by Chris Sears
    Greetings, I'm working with RHEL 5.5 guest VMs under VMware ESX 4. When I configure the virtual disks in the VM hardware settings, each disk has a SCSI address in the format "N:M". For example, "1:3" would mean SCSI host number 1 and SCSI target ID 3. When I look at the disk info from the VM's BIOS or a Windows OS, the detected SCSI address info matches up with the virtual hardware settings. But under Linux, the SCSI address components don't match up, at least not completely or consistently. I've tried the three supported virtual SCSI and SAS drivers and they all seem to be "broken", but in different ways. Here's a list of the virtual hardware addresses vs what was detected under Linux with each of the drivers: Driver vHW Addr Linux Addr -------- -------- ---------- LSI SAS 0:0 0:0 LSI SAS 0:3 0:1 LSI SAS 0:6 0:2 LSI SCSI 1:1 2:1 LSI SCSI 1:4 2:4 LSI SCSI 1:7 2:7 pvSCSI 2:2 1:2 pvSCSI 2:5 1:5 pvSCSI 2:8 1:8 My main question is why does this happen under Linux? The next question is: how do I get it fixed or fix it myself? If I was going to guess, I'd say it's an issue with how the kernel is handing out the SCSI host number and how the Linux SCSI driver (included with VMware tools) is detecting the SCSI target number. Perhaps the order the drivers are loaded also has something to do with the issue. I'm guessing this would not involve udev, but I could be wrong. Any thoughts would be appreciated. Thanks! PS. My environment is VMware, but I don't need an answer for these drivers specifically. I imagine this might be a problem with any SCSI driver under Linux.

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  • Want to use something like Citrix XenDesktop, Free Alternative?

    - by Chris
    I'm looking to go into IT, general office server management, and it looks like XenDesktop would be a awesome tool to use. If I get it right, you would store a central image of the OS you want to deploy (in an iso file) on the main server. Then use XenDesktop to pull that image down to the client, and it will then boot the OS inside of the virtual machine. Does it download the image of the OS and store it locally (like cloning the VM onto the client?) I'd love to find a free (possibly open source?) alternative to this, I keep on hearing about KVM in Linux and PXE booting a minimalistic OS to use remote KVMs.... Would that be what I'm looking for? Ideally, I'd like a system.. - That allows me to manage one central image for multiple clients (virtualized hardware) - Easily boot a thin client OS that connected to XenDesktop. Would those things be possible with some kind of free alternative? Some guidance would be greatly appreciated.

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  • IIS 7.5 - how to get?

    - by Chris Lively
    My servers are currently running IIS 7 (windows 2008). Is there any way to get IIS 7.5 without upgrading to 2008 R2? The reason I ask is that they are 32 bit servers and there is no upgrade path from 32 bit 2008 to 2008 R2.

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  • Facebook, Twitter, Yahoo doesn't work. CDN problem. Akamai?

    - by Toktik
    Some sites doesn't work normally, they are open, without css, images and javascript errors... Facebook stucks on static.ak.fbcdn.net Twitter stucks on a1.twimg.com Yahoo stucks on l.yimg.com On firefox I'm receiving Waiting for ...(any of those). I can access facebook only with SSL. Like https://facebook.com I ping them, only receive request timed out. Update: When I ping static.ak.fbcdn.net I refer to a749.g.akamai.net, when I ping this server I get Request timed out.

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  • Hanging of host network connections when starting KVM guest on bridge

    - by Chris Phillips
    Hi, I've a KVM system upon which I'm running a network bridge directly between all VM's and a bond0 (eth0, eth1) on the host OS. As such, all machines are presented on the same subnet, available outside of the box. The bond is doing mode 1 active / passive, with an arp_ip_target set to the default gateway, which has caused some issues in itself, but I can't see the bond configs mattering here myself. I'm seeing odd things most times when I stop and start a guest on the platform, in that on the host I lose network connectivity (icmp, ssh) for about 30 seconds. I don't lose connectivity on the other already running VM's though... they can always ping the default GW, but the host can't. I say "about 30 seconds" but from some tests it actually seems to be 28 seconds usually (or at least, I lose 28 pings...) and I'm wondering if this somehow relates to the bridge config. I'm not running STP on the bridge at all, and the forwarding delay is set to 1 second, path cost on the bond0 lowered to 10 and port priority of bond0 also lowered to 1. As such I don't think that the bridge should ever be able to think that bond0 is not connected just fine (as continued guest connectivity implies) yet the IP of the host, which is on the bridge device (... could that matter?? ) becomes unreachable. I'm fairly sure it's about the bridged networking, but at the same time as this happens when a VM is started there are clearly loads of other things also happening so maybe I'm way off the mark. Lack of connectivity: # ping 10.20.11.254 PING 10.20.11.254 (10.20.11.254) 56(84) bytes of data. 64 bytes from 10.20.11.254: icmp_seq=1 ttl=255 time=0.921 ms 64 bytes from 10.20.11.254: icmp_seq=2 ttl=255 time=0.541 ms type=1700 audit(1293462808.589:325): dev=vnet6 prom=256 old_prom=0 auid=42949672 95 ses=4294967295 type=1700 audit(1293462808.604:326): dev=vnet7 prom=256 old_prom=0 auid=42949672 95 ses=4294967295 type=1700 audit(1293462808.618:327): dev=vnet8 prom=256 old_prom=0 auid=42949672 95 ses=4294967295 kvm: 14116: cpu0 unimplemented perfctr wrmsr: 0x186 data 0x130079 kvm: 14116: cpu0 unimplemented perfctr wrmsr: 0xc1 data 0xffdd694a kvm: 14116: cpu0 unimplemented perfctr wrmsr: 0x186 data 0x530079 64 bytes from 10.20.11.254: icmp_seq=30 ttl=255 time=0.514 ms 64 bytes from 10.20.11.254: icmp_seq=31 ttl=255 time=0.551 ms 64 bytes from 10.20.11.254: icmp_seq=32 ttl=255 time=0.437 ms 64 bytes from 10.20.11.254: icmp_seq=33 ttl=255 time=0.392 ms brctl output of relevant bridge: # brctl showstp brdev brdev bridge id 8000.b2e1378d1396 designated root 8000.b2e1378d1396 root port 0 path cost 0 max age 19.99 bridge max age 19.99 hello time 1.99 bridge hello time 1.99 forward delay 0.99 bridge forward delay 0.99 ageing time 299.95 hello timer 0.50 tcn timer 0.00 topology change timer 0.00 gc timer 0.04 flags vnet5 (3) port id 8003 state forwarding designated root 8000.b2e1378d1396 path cost 100 designated bridge 8000.b2e1378d1396 message age timer 0.00 designated port 8003 forward delay timer 0.00 designated cost 0 hold timer 0.00 flags vnet0 (2) port id 8002 state forwarding designated root 8000.b2e1378d1396 path cost 100 designated bridge 8000.b2e1378d1396 message age timer 0.00 designated port 8002 forward delay timer 0.00 designated cost 0 hold timer 0.00 flags bond0 (1) port id 0001 state forwarding designated root 8000.b2e1378d1396 path cost 10 designated bridge 8000.b2e1378d1396 message age timer 0.00 designated port 0001 forward delay timer 0.00 designated cost 0 hold timer 0.00 flags I do see the new port listed as learning, but in line with the forward delay, only for 1 or 2 seconds when polling the brctl output on a loop. All pointers, tips or stabs in the dark appreciated.

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  • Pin the Dock to the top or disable it

    - by Chris Buchholz
    I wonder if it is possible to pin the Mac OS X Dock to the top in Snow Leopard? I see lets of ideas on how to do this when I google for it, and Secrets (the tweaking app) also provide it as an option, but I don't see any of the ways working for me. I guess it must have worked at some point, since people said it did, but I believe this feature might have been removed from Snow Leopard, and therefore does not work for me. Is this so? Is there really no way to pin the Dock to the top of screen? If not, what ways of "getting rid of the dock" can you guys recommend? I have tried with auto-hiding, but my problem is that this will leave a 4px line at the edge of where the Dock is pinned to, that applications wont cover. Thats not ideal for me. As far as I have understood from googling, this line will not appear if the Dock is pinned to the top, hence my question. What other ways do you guys use to get rid of it?

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  • DNS failover in a two datacenter scenario

    - by wanson
    I'm trying to implement a low-cost solution for website high availability. I'm looking for the downsides of the following scenario: I have two servers with the same configuration, content, mysql replication (dual-master). They are in different datacenters - let's call them serverA and serverB. Users use serverA - serverB is more like a backup. Now, I want to use DNS failover, to switch users from serverA to serverB when serverA goes down. My idea is that I setup DNS servers (bind/powerdns) on serverA and serverB - let's call them ns1.website.com and ns2.website.com (assuming I own website.com). Then I configure my domain to use them as its nameservers. Both DNS servers will return serverA IP as my website's IP. If serverA goes down I can (either manually or automatically from serverB) change configuration of serverB's DNS, to return IP of serverB as website's IP. Of course the TTL will be low, as it's supposed to be in DNS failovers. I know that it may take some time to switch to serverB (DNS ttl, time to detect serverA failure, serverB DNS reconfiguration etc), and that some small part of users won't use serverB anyway. And I'm OK with that. But what are other downsides of such an approach? An alternative scenario is that ns1.website.com will return serverA IP as website's IP, and ns2.website.com will return serverB IP as website's IP. But AFAIK clients not always use primary nameserver and sometimes would use secondary one. So some small part of users would use serverB instead of serverA which is not quite what I'd like. Can you confirm that DNS clients behave like that and can you tell what percentage of clients would possibly use serverB instead of serverA (statistically)? This one also has the downside that when serverA goes back up, it will be automatically used as website's primary server, which is also a bad situation (cold cache, mysql replication could fail in the meantime etc). So I'm adding it only as a theoretical alternative. I was thinking about using some professional DNS failover companies but they charge for the number of DNS requests and the fees are very high (why?)

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  • Plone site randomly serving wrong content

    - by Chris Miller
    I have a Plone site that has begun to randomly serve up the wrong content. Any given content suddenly shows something else. Sometimes a JPEG loads a stylesheet instead or a stylesheet loads as a page or a page as an image. The images move around, some times our site logo shows a bullet, or one of the other site images. Fiddler shows the wrong content in the response, the apache logs show the content type of the incorrect file (so if the an image loads in place of a style sheet, apache shows that). We thought mod_proxy was the source of our grief, but we get the problem hitting Zope directly. I never get the wrong content using the Medusa Monitor to repeatedly hit the content. I do see ConflictErrors in the instance.log file, and they seem to be correlated to the problem, but not 100%. ZPublisher.Conflict ConflictError at \path\to\object: database conflict error (oid 0x3586, class BTrees._OIBTree.OIBTree, serial this txn started with blah, serial currently committed blah) (X conflicts (0 unresolved) since startup blah) I pulled that off the web, it's not from our logs, but it's the same message. This may be a red herring, it sounds like those messages are normal. We've updated to the 3.3.5, same problems. I'm at a loss. I'm wondering if there a good way to intercept what is being served? Secondly, is there a way to increase the verbosity of the access log to included the content-type? I've even seen the problem manifest in ZMI. It happens more often when we're authenticated. Sometimes it can take a thousand reloads to see the problem, other times it happens in different ways every time we reload. I believe we've seen this problem for a couple years, but it was very intermittent, a page would show the content of a GIF, then a reload later wouldn't happen for a long time. Now it's a huge problem.

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  • Intermittent 5.7.1 email bounce to Exchange 2007

    - by Steve Kennaird
    My knowledge of Exchange isn't particularly great, so excuse me if some of the terminology I use isn't quite right. I'm primarily a web developer who's now responsible for a small business's network. We have a server running SBS 2008 and Exchange 2007. Generally, everything works well, emails are able to be sent to both internal and external domains without issue. We've only got ~20 users, Exchange is sitting on a single server. I use SendGrid to send emails generated by our externally hosted website to users in the office. Primarily, order notifications are sent to orders@somedomain.com. Without any pattern and less than once per week on average, an email to orders@somedomain.com will bounce back, and the logs on SendGrid detail the following error: 550 5.7.1 Unable to relay for orders@somedomain.com Either side of that failed delivery attempt, I'm able to send and receive emails to/from orders@somedomain.com. Having done some research, incorrect reverse DNS seems like it could be a cause of intermittent bounces like this. Having used nslookup, I have found that the reverse DNS doesn't map like it should, e.g. Office IP: 135.325.351.123 (made up IP, for example only) Domain: office.somedomain.com (made up, for example only) Reverse DNS: somedomain.gotadsl.co.uk (half made up) Could this be a cause? I'm sure that the IP address and the domain should map to each other. Also, it has been suggested to me that as the Exchange server is on a network with an ADSL connection, that could be a potential cause as the connection "goes up and down all day long". I don't have an opinion on this, as I don't have enough knowledge of Exchange/ADSL to form a reliable opinion. Can anyone offer any insight as to whether one or both are actually potential causes, or if there is another possible cause?

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  • Nginx and Tomcat 6 proxy pass

    - by Patrick Schneider
    i've got problems tp configure nginx as reverse proxy for an tomcat application. I want to set domain www.example.com/blog to pass to an tomcat application. nginx-site: server { listen 80; servername example.com; location /blog { proxy_pass http://localhost:8080/blog; proxy_redirect off; } } Now when i call on my browser http://example.com/blog it redirects to localhost/blog which does not work. curl http://localhost:8080/blog -H "host: example.com/blog" -v shows a 302 to localhost/blog Any ideas?

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  • Apache log - file does not exist

    - by Ivan
    I have quite a few of these in Apache logs piling up every day: [Mon Jun 09 20:42:58 2014] [error] [client 180.153.214.181] File does not exist: /home/user/public_html/ajax.googleapis.com, referer: http://www.mysite.com//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js I have over 200k visitors per day but a few of them like a dozen or so are generating the above error. I can't figure out what may be causing it. Checked the html code and it's all good so I ran out of ideas.

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  • Centos/Postfix able to send mail but not receive it

    - by Dan Hastings
    I have set up postfix and used the mail command to test and an email was successfully sent and delivered. The email arrived in my yahoo inbox BUT the sender also recieved an email in the Maildir directory saying "I'm sorry to have to inform you that your message could not be delivered to one or more recipients", even though the message was delivered. I tried replying from yahoo to the email but it never arrived. I have 1 MX record added to godaddy which i did last week. Priority0 Host @ Points to mail.domain.com TTL1 Hour Postfix main.cf has the following added to it myhostname = mail.domain.com mydomain = domain.com myorigin = $mydomain inet_interfaces = all mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain mynetworks = 192.168.0.0/24, 127.0.0.0/8 relay_domains = home_mailbox = Maildir/ I checked var/logs/maillog and found the following errors occuring postfix/anvil[18714]: statistics: max connection rate 1/60s for (smtp:unknown) at Jun 3 09:30:15 postfix/anvil[18714]: statistics: max connection count 1 for (smtp:unknown) at Jun 3 09:30:15 postfix/anvil[18714]: statistics: max cache size 1 at Jun 3 09:30:15 postfix/smtpd[18772]: connect from unknown[unknown] postfix/smtpd[18772]: lost connection after CONNECT from unknown[unknown] postfix/smtpd[18772]: disconnect from unknown[unknown] output of postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix debug_peer_level = 2 home_mailbox = Maildir/ html_directory = no inet_interfaces = all inet_protocols = all mail_owner = postfix mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain mydomain = domain.com myhostname = mail.domain.com mynetworks = 168.100.189.0/28, 127.0.0.0/8 myorigin = $mydomain newaliases_path = /usr/bin/newaliases.postfix queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES relay_domains = sample_directory = /usr/share/doc/postfix-2.6.6/samples sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop unknown_local_recipient_reject_code = 550

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  • How to troubleshoot when one has no idea where to start?

    - by Chris Walton
    I am looking for hints, tips and answers on how to get started on troubleshooting when: The problem is intermittent The problem could lie literally anywhere - operating system; free source software; my own software developments; purchased software; crumbs on the keyboard; the specific combination of software I am currently running; Maxwell's demon; the little blue men actually running the machine have gone on strike; etc. I have expertise only in a few of the areas that are potential candidates for the cause of the problem. The specific problem I am having is detailed below as an example, but I am not seeking answers to my current problem, but rather where and how to start on tackling such problems. I am currently encountering a problem with my new machine. On a few occasions the machine has just frozen; not accepting keystrokes, mouseclicks, or anything except the power on/off switch. Invariably I have been merely browsing the web; I have had a few (<= 6 other applications) running. None of these applications are major; and represent a mix of commercial programs and open source programs, typically migrated from Unix of some variety. My machine is a Windows 7 I7 quad core laptop.

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  • iptables rules to allow HTTP traffic to one domain only

    - by Emily
    Hi everyone, I need to configure my machine as to allow HTTP traffic to/from serverfault.com only. All other websites, services ports are not accessible. I came up with these iptables rules: #drop everything iptables -P INPUT DROP iptables -P OUTPUT DROP #Now, allow connection to website serverfault.com on port 80 iptables -A OUTPUT -p tcp -d serverfault.com --dport 80 -j ACCEPT iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT #allow loopback iptables -I INPUT 1 -i lo -j ACCEPT It doesn't work quite well: After I drop everything, and move on to rule 3: iptables -A OUTPUT -p tcp -d serverfault.com --dport 80 -j ACCEPT I get this error: iptables v1.4.4: host/network `serverfault.com' not found Try `iptables -h' or 'iptables --help' for more information. Do you think it is related to DNS? Should I allow it as well? Or should I just put IP addresses in the rules? Do you think what I'm trying to do could be achieved with simpler rules? How? I would appreciate any help or hints on this. Thanks a lot!

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  • How to map a user to a domain, with Usermin and Postfix?

    - by HappyDeveloper
    What I need is to create a couple of websites, each one with only one user, which is allowed to send mails from any address @ his own domain. Example: Site foo.com would have an user foo, which can send mails from anything@foo.com. Currently, when the user logins to Usermin, the default 'from' field is example-dns.net (editable) I want it to show an editable field for the user part, and @foo.com (non editable) So how can I do this? Is there some way to automate this?

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  • How to map a user to a domain, with Usermin and Postfix?

    - by HappyDeveloper
    What I need is to create a couple of websites, each one with only one user, which is allowed to send mails from any address @ his own domain. Example: Site foo.com would have an user foo, which can send mails from anything@foo.com. Currently, when the user logins to Usermin, the default 'from' field is example-dns.net (editable) I want it to show an editable field for the user part, and @foo.com (non editable) So how can I do this? Is there some way to automate this?

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  • Reliable Linux RAID Card

    - by Chris S
    Can anyone recommend an appropriate RAID card for use under Linux (Ubuntu)? I have three Western Digital SATA drives, and would like to setup either RAID-1 or RAID-5. Software RAID has been very flakey and unreliable for me (e.g. it doesn't seem to mirror the boot partition). Unfortunately, most RAID cards I've seen online don't mention any Linux driver support. Would most cards work in Linux, or do I have to look at a select few that explicitly support Linux?

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  • Apache Reverse proxy Http to https

    - by Coppes
    I have a website which is fully running on Https. For some reason i did get the task to find a way to convert a url for example: http://www.domain.com/a/e-nc/youless to a https version of it, without losing HTTP POST header such as the POST values which are in it. So i thought (not even sure) let's try to make a reversed proxy in apache and see how that works. Anyway after a lot of struggling i came to the point to ask it here. So to be speicific my goal is: Convert the http://www.domain.com/a/e-nc/youless to https://www.domain.com/a/e-nc/youless without losing the POST conditions. What i have tried until now is the following: Created a file called: proxiedhosts in my apache2/sites-enabled folder with the following contents: SSLProxyEngine On SSLProxyCACertificateFile /etc/apache2/ssl/certificate****.pem ProxyRequests Off ProxyPreserveHost On <Proxy *> Order allow,deny Allow from all </Proxy> ProxyPass /a/e-nc/youless/ https://www.domain.com/a/e-nc/youless/ ProxyPassReverse /a/e-nc/youless/ https://www.domain.com/a/e-nc/youless/ Thanks in advance!

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