How To Reduce Downtime - Multiple Nameservers
Mar 3, 2009
How to reduce downtime - multiple name servers ?
Say I have two different hosting accounts at two different web hosts. One at host1.com and another at host2.com. In both the hosts I keep the same files. I use an external registrar and use the name servers for one of my domains as follows:
ns1.host1.com
ns1.host2.com
ns2.host1.com
ns2.host2.com
What would happen in that case, if say host1 is down sometime? Will the name servers point to host2.com?
If this could work, then the probability of downtime of a site would become almost 0 .
Google will like this ?
Another question is how to easily sincronize both cpanel accounts?
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Jan 30, 2007
How can I use:
ns1.domain.com
ns2.domain.com
both with the same IP?
I figured out that since they are both hosted on one server it doesn't really matter if it'll be 2 different IPs or a single one so I decided to be more economic
Only thing is that through Cpanel (Networking Setup -> Nameserver IPs) I can't add two nameservers with the same IP...
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Jul 16, 2009
I have 2x servers with the following os/control panels:
1x Windows Server 2008 running Plesk 9.2
1x Centos 5.3 running cPanel/WHM
What I wish to do is to point all of my domains to the nameservers:
ns1.domain.com
ns2.domain.com
But, the domains hosted could be on either of the boxes above (because some sites are ASP.NET and others PHP).
Each of the above machines are running BIND and I have not yet setup nameservers on either of them. How should I proceed with this?
In addition (for arguments sake), if I then add additional servers how would I then achieve the same?
If there's already stuff around on the forum (I've done a search but found nothing specified to my issue of running a windows and linux box with completely different control panels) please point me in the right direction.
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Oct 10, 2008
Let's say I've got a VPS plan that comes with either 4 or 8 IP addresses (still deciding which to get).
Now let's say I want to set up multiple NameServers within that account. Example:
ns1.mymainsite.com
ns2.mymainsite.com
ns1.anothersite.com
ns2.anothersite.com
ns1.yetanother.com
ns2.yetanother.com
ns1.lastone.com
ns2.lastone.com
Can this be done? Or not?
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Apr 30, 2007
I run a small hosting company and i have been using multiple (different) nameservers for different servers, for example...
Nameserver IP
ns1a.domain.com 192.168.0.1
ns2a.domain.com 192.168.0.2
ns1b.domain.com 123.123.0.1
ns2b.domain.com 123.123.0.2
How do i make it so i can have ns1.domain.com and ns2.domain.com pointing to all different my servers?
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Apr 26, 2007
Lets say for example I have 10 servers independent of each other. I want to be able to have only 2 Nameservers, NS1 and NS2 where all the domains should resolve to and then they should be handed off to one of the 10 servers. I dont want to have 20 Nameservers for example NS1 thru NS20 for all 10 servers. That would also be a waste of IP addresses.
I have a few murky solutions in mind. I would appreciate if someone would shed some light on the issue,
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May 7, 2009
Can the same nameservers be used on multiple servers/vps on different geographical locations and if so, how are they setup? That would save me quite some money. Hoping for some input.
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Feb 11, 2007
Say if I have a domain www.example.com.
And two completely different physical dedicated servers with IPs 11.11.11.11 and 22.22.22.22
Is it possible to make a nameserver,
NS1.EXAMPLE.COM (33.33.33.33)
NS2.EXAMPLE.COM (44.44.44.44)
^^^^^^^^^
(The two IPs of the nameserver have been assigned to server 11.11.11.11)
to point to 11.11.11.11 and have two other name servers
NS3.EXAMPLE.COM (55.55.55.55)
NS4.EXAMPLE.COM (66.66.66.66)
^^^^^^^^
(The two IPs of the nameserver have been assigned to server 22.22.22.22)
to point to 22.22.22.22 and have two other name servers
I am pretty sure this wont work for some reason but I cant figure out why
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May 26, 2008
Will the nameservers work if the nameservers are pointed to a parking page?
For example:
I need to change my nameservers to ns1.mywebhost.com and ns2.mywebhost.com
(nameservers are made up)
These nameservers are from my web hosting service provider. When I visit the nameservers, it shows up a parking page from a domain parking service (let's say NameDrive parking page)
Will the nameservers function correctly and will my websites work? I have this question because usually the nameservers that I use, they always point to a CP page or something like that rather than a parking page.
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Mar 18, 2008
Last year my web host stated that my site was over utilizing allowed resources for my plan. Specifically, they state that I was overusing the CPU. At the time, I had to upgrade my plan in order to stay online. I would like to move to a new host, but the prospective hosts are all suggesting a dedicated server because of my CPU usage. I don't want to pay that kind of money, so I would really like to curb the CPU problem. Does anyone know how to reduce the CPU of a Wordpress blog? I tried posting this question over at Wordpress.org, but I haven't received a single reply.
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Mar 18, 2008
My server details
Intel 2.4 Ghz P4 Celeron
os-redhat
RAM-2GB DDR
harddisk-160+50Gb
bandwith-3000Gb
now iam haveing more that 0.50-1.20 cpu useage,also cpu useage is also increased i hosted only 6 site out what only one site use MSQL all other site are plain download site,how to reduce the cpu load can u figure me out this issue also give me some tips to reduce the cpu usage
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Jul 3, 2008
13438 nobody 15 0 42276 22m 13m R 22 2.2 1:51.94 httpd
10620 nobody 16 0 41928 16m 8468 S 19 1.7 0:28.54 httpd
11397 nobody 15 0 41524 12m 4784 S 18 1.3 0:06.04 httpd
10745 nobody 15 0 42376 14m 5316 S 17 1.4 0:06.62 httpd
The values in bold are the CPU percentage taken up by each apache process.
So i had to need to each apache process,who can i reduce it?what config i have to change to reduce it?
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Jul 6, 2008
we have a dual xeon 2.8G +2G ram CPANEL server normally load is well under2 and stable
we also use Incremental Backup and choose Per Account Only for MySQL backup
This server mainly hosts a big site, whose SQL is 1.2G big
Everytime server is running backup, load burst to 7 and accessing to website hanged. We are thinking to change SQL backup method to Entire MySQL Directory , but was told while it is processing SQL server will be stopped ?? wil Entire MySQL Directory reduce server load while processing SQL backup?
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Jul 7, 2007
apparently the sysctl commands / config does not work for VPS's. any way to reduce the time_wait period? got nearly 900 connections in that state!
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Jul 9, 2007
I have smokeping monitoring my game servers and so far in the little time that it has been running all my game servers have been encountering an average of 4 to 10% packet loss. Are there are tweaks i can run on the server computer to reduce packet loss? (registry modifications, etc.)
I downloaded a TCP tweak program called "TCP Optimizer" is it safe to run on a Windows 2003 Server OS?
The colo connection is an OC 192 and i have a 100Mbit ethernet card.
Here are my current TCP settings:
Quote:
[SYSTEMCurrentControlSetServicesTcpipParameters]
TcpWindowSize=-1
GlobalMaxTcpWindowSize=-1
EnablePMTUDiscovery=-1
EnablePMTUBHDetect=-1
SackOpts=-1
DefaultTTL=-1
TcpMaxDupAcks=-1
Tcp1323Opts=-1
DisableUserTOSSetting=-1
DefaultTOSValue=-1
[SYSTEMCurrentControlSetServicesAfdParameters]
DefaultReceiveWindow=-1
[SoftwareMicrosoftWindowsCurrentVersionInternet Settings]
MaxConnectionsPerServer=-1
MaxConnectionsPer1_0Server=-1
[SYSTEMCurrentControlSetServicesICSharingSettingsGeneral]
InternetMTU=-1
[SOFTWAREMicrosoftWindowsCurrentVersionExplorerRemoteComputerNameSpace{D6277990-4C6A-11CF-8D87-00AA0060F5BF}]
{D6277990-4C6A-11CF-8D87-00AA0060F5BF}=-1
[SYSTEMCurrentControlSetServicesDnscacheParameters]
MaxNegativeCacheTtl=-1
NegativeCacheTime=-1
NetFailureCacheTime=-1
NegativeSOACacheTime=-1
[SOFTWAREPoliciesMicrosoftWindowsPsched]
NonBestEffortLimit=-5
[SYSTEMCurrentControlSetServicesTcpipServiceProvider]
LocalPriority=499
HostsPriority=500
DnsPriority=2000
NetbtPriority=2001
[SystemCurrentControlSetServicesLanmanServerParameters]
SizReqBuf=-1
[SYSTEMCurrentControlSetServicesNdisWanParametersProtocols]
ProtocolMTU=-2
[SYSTEMCurrentControlSetServicesTcpipParametersInterfaces{D63AC0FA-D2C9-4D83-B057-31A353516AB3}]
MTU=-1
TcpWindowSize=-1
[SYSTEMCurrentControlSetServicesPschedParametersAdapters{D63AC0FA-D2C9-4D83-B057-31A353516AB3}]
NonBestEffortLimit=-2
[SYSTEMCurrentControlSetServicesTcpipParametersInterfaces{8190D94A-3B2D-45C4-998D-312E99D6061D}]
MTU=-1
TcpWindowSize=-1
[SYSTEMCurrentControlSetServicesPschedParametersAdapters{8190D94A-3B2D-45C4-998D-312E99D6061D}]
NonBestEffortLimit=-2
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Jan 24, 2007
I know there is no device can protect you from ddos attacks, but I wonder which one is the best to help you reduce the attacks? It might be intelligent to "feel" the attacks? Brand names from Cisco, Foundry, Nokia...?
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Apr 18, 2009
Few months ago I bought new small VPS box (OpenVZ, 128 MB RAM) in order to place there a new monitoring node of my site monitoring system. Such small amount of RAM is a challenge for operating system optimisation techniques (OpenVZ doesn’t have “swap” as Xen does).
First of all I discovered that apache2-mpm-worker (Apache implementation that uses threads) consumes more memory (100MB) than the classic version that use separate processes (20MB). I had to switch to apache2-mpm-prefork version then.
Next unpleasant suprise: small Python app eats 100MB of virtual memory! I checked that virtual (not resident) memory is taken into account by VPS. I applied some tools to locate memory bottleneck, but without success. Next I added logs with current memory usage to track call that causes big memory consumption. I tracked the following line:
server = WSGIServer(app)
is guilty for high memory increase. After few minutes of googling I located problem: default stack size for a thread. Details:This line creates few threads to handle concurrent calls
Stack size is counted towards virtual memory
Default stack size is very high on Linux (8MB)
Every thread uses separate stack
=> multi threaded application will use at least number_of_threads * 8MB virtual memory!
First solution: use limits.conf file. I altered /etc/security/limits.conf file and changed default stack size. But I couldn’t make this change to alter Python scripts called from Apache (any suggestions why?).
Second (working) solution: lower default stack size using ulimit. For processes launched from Apache I altered /etc/init.d/apache2 script and added:
ulimit -s 256
Now every thread (in apache / Python application) will use only 128 kB of virtual memory (I lowered VSZ from 70 MB to 17 MB this way). Now I have additional space to enlarge MySQL buffers to make DB operations faster.
There’s even better place to inject ulimit system-wide: you can insert this call in:
/etc/init.d/rc
script. Then ulimit will be applied to all daemons (as Apache) and all login sessions. I reduced virtual memory usage by 50% this way.
Note: you may increase stack size on stack overflow errors. In my opinion 256 kb is safe option for most systems, you may increase if in doubt. Still memory savings are big.
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Apr 20, 2009
its 2am night here, and my sites are down....now there is no way i have too much traffic at midnight, also all my websites are new !
this is happening consistently since today morning and im getting no support apart from jargon filled replies from customer care
how do i tweak apache settings and what settings do i make to avoid this ?
im wondering what will happen after few months when my websites actually have good traffic coming in ?
We have checked your server. Please see the load average and process list given below:
The value 4.42 was the CPU load average at the time. A normal load should be below 1.00. I could see that Apache service is causing high load in your server.
So you can tweak Apache in order to reduce the CPU load. Please check and let us know if you need any further assistance.
++++++++++++++++++
[root@chi07 ~]# vzctl exec 18403 w
03:16:20 up 2 min, 0 users, load average: 4.42, 1.42, 0.50
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
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Feb 24, 2008
1) Use PHP as isapi module
2) Open Internet Information Services (IIS) Manager > Right Click On "Web Sites" select properties > Click Service Tab > Open HTTP Compression > Select Compress Application Files and Compress Static Files
3) Use eAccelerator (PHP accelerator, optimizer, and dynamic content cache) with This options;
eaccelerator.shm_size="64"
eaccelerator.cache_dir="c: mpmmcache"
eaccelerator.enable="1"
eaccelerator.optimizer="1"
eaccelerator.check_mtime="1"
eaccelerator.debug="0"
eaccelerator.filter=""
eaccelerator.shm_max="0"
eaccelerator.shm_ttl="0"
eaccelerator.shm_prune_period="0"
eaccelerator.shm_only="0"
eaccelerator.compress="1"
eaccelerator.compress_level="9"
eaccelerator.keys = "shm"
eaccelerator.sessions = "shm"
eaccelerator.content = "shm"
4) Don't load this extensions,
extension=php_mbstring.dll
extension=php_domxml.dll
extension=php_xslt.dll
Only use this Extensions in php.ini
extension=php_sqlite.dll
extension=php_curl.dll
extension=php_gd2.dll
extension=php_gettext.dll
extension=php_iconv.dll
extension=php_imap.dll
extension=php_mssql.dll
extension=php_sockets.dll
extension="eaccelerator.dll"
upload_tmp_dir= "C:WINDOWSTemp"
This Settings tested on Windows Server 2003 SP2 IIS6 with PHP v4.4.7
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Oct 29, 2008
I have registered a domain using godaddy. I have hosted my site on a server of my shared hosting provider(lets call them X).Currently I have pointed mydomain.com to the server and it is up and running.Sometimes, I have experienced downtimes.
In order to solve this problem, I have hosted a clone of my site on another server from another hosting company(lets call them Y).
1. I want mydomain.com to point to Y when X is down
2. again point it to X when it is up.
My main aim is to have my site live with less downtime. The probability having both servers down is very less.
I dont know if it is technically feasible, just a thought out of dirty mind. I tried to google but was not able to find an answer specific to my problem.
Can anybody tell me how to achieve this through godaddy domain.
Added note, My site is not a commercial site and I cant afford large dedicated servers with clustering and failovers.
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Oct 31, 2008
I would like to know if there's any way we could reduce "conversion times" for videos while converting them with "mencoder" and "x264 codec"?
Is it possible to cluster 2-3 or more servers (Quad core/8GB RAM) so that I can reduce the conversion timings effectively?
The original video sizes are around 500-700MB on an average and I'd like to convert them using mencoder in x264 codec @ 500Kbps bitrate and 2pass settings.
Ofcourse it'll take atleast 1-2hours to encode 1 such video at these settings on a 'single' such server, so is there a way to reduce the conversion times to around 10-15minutes/video by using "parallel encoding" with x264 codec?P.S: I know how to form a cluster, using beowulf/rocks, etc...what I need help with is 'using' the cluster with x264 codec
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Aug 26, 2014
Basically I would like to record only certain status code entries in my access log. For example I would like to skip all entries with 200 status.
The documentation under "Modifiers" [URL] .... works somewhat but it still makes an entry in the AccessLog file.
This line in httpd.conf
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Mar 19, 2007
I did a quick search on this and could not see it as already being posted
It seems quite a clever but simple idea - remove a lot of the oxygen from the air to help reduce the risk of fire. What do those of you operating your own facilities make of this? Is anyone already doing this?
[url]
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Nov 11, 2014
I have two domains as virtual hosts on same IP address.
I am getting certificate error for the second domain when I try to check email (using MS Outlook). I can't permanently "accept" certificate, it complains again and again. Certuficate I created and self signed for imap.domain1.com, but the second email server is imap.domain2.com, so it complains.
How do I set separate email certificates for two domains? Is it possible at all?
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Nov 9, 2012
Depending on where u are at on my site (documents pages, training, main root, etc.) will depend on which type of background, footer, header and the like you'll get. Now I was thinking. Is there a way to have multiple error messages for more then one page depending on where you are at on a site? Right now it's intranet site and a modded snitz forum. What is the code and were does it go and in which apache conf file(s) does it go in?
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Apr 30, 2008
In your opinion how much downtime is too much downtime?
1, 2, 5 hours over the course of a month? 99.8%, 98%, 95% total uptime too little?
I mean I can understand technical difficulties and I am willing to be patient with my host especially when the service (when it is up) is good but where exactly do you draw the line, start asking questions, or canceling that contract and demanding your refund?
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Jul 17, 2007
i have 150 domains my server I wish it to migrate to a new server I can do restore domains, mail and users and data, stats to new server. I need minimum downtime so I need your's advice step by step which service need to restore first so my user get minimum downtime.
WIndows 2003 Enterprise
Helm3.2.15.
IIS6.
Smatermail4.
smarterstats.
MSDNS.
MSFTP.
MySQL5.x.
SQL server2005.
.
.
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Oct 19, 2009
Moved to them recently from Wiredtree as my clients were asking for a uk-based server. I am a small time host, mainly to friends and family.
I've had more downtime in a week with VPS Ville than I ever had with Wiredtree.
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Jan 4, 2009
i've recently been experiencing a lot of apache downtime on my eUKhost VPS. anyone else having this problem? it's driving me crazy and i'm thinking about moving.
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