Slow Dns Lookups
Sep 21, 2007
what I broke
Fairly new VPS running centos + cpanel
Getting very slow dns lookups > 4 seconds, sometimes as long as 10 seconds, via both php and shell ping tests, etc. Pinging via IP is very fast.
named is running (tried restart, no change)
In cpanel the resolvers are set to the proper datacenter Nameserver IPs.
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Feb 24, 2008
I have got a dedicated server running Fedora Core 7.
My problem is that I am trying to run yum updates using the default repos and it failes to respond and check any mirrors?
I have tried to disable ipv6 and changed some tcp timeout settings along with the resolver.conf name servers and has appeared to fix the wget timeouts but yum is still slow.
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Jan 6, 2007
when i do a recursion no;" in the "options" of named.conf it blocks email from coming into the server, and out as well.
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Apr 13, 2008
Is there a way you can hide from the whois lookups how many site's you have hosted on your server? Like, for the reverse IP, usually it'll mention how many sites are hosted on the server when you do a whois lookup.
Is there a way to prevent it from doing that?
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Mar 15, 2008
I am trying to debug a dns problem.
What I need is for you to do a dns lookup and report:
1) the address that was returned, the last octect will do.
2) the area of the world you queried from
The answers *will* vary because the dns server is geolocation enabled. Or, at least they *should* vary. But, someone claims its buggered.
The host name to lookup is:
ssl.dnsmasq.com
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Oct 3, 2007
when I enable csf my server looses the ability to do an nameserver lookups. It doesn't seem like port 53 is being blocked, I've added the 2 nameservers in /etc/resolve.conf to my csf.allow file, but still nothing. Outgoing mail fails because it can't lookup domain names, I've tried nslookup from the command line and it times out. I'm out of ideas. Am I wrong about looking at port 53? Do I need to whitelist some other IP I'm missing? This is a RHEL5 server.
iptables --line-numbers -L OUTPUT -n | grep :53
39 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:53
49 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 state NEW udp dpt:53
54 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt:53 dpt:53
55 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp spt:53 dpt:53
56 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spts:1024:65535 dpt:53
57 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp spts:1024:65535 dpt:53
58 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp spt:53 dpts:1024:65535
59 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp spt:53 dpts:1024:65535
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Jul 24, 2008
DNS lookups against domains on my server are suddenly failing. The /etc/resolv.conf shows 3 entries for uplink DNS servers at my provider (theplanet). Bind is running, too.
What else could cause this? All sites are accessible via IP, but not by name anymore.
Cpanel/WHM server
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Nov 11, 2008
I've got 25 domains on a Virtuozzo/Plesk8.6/CentOS5 VPS. Each domain has one up-to-date install of WordPress, most have very little traffic (average 200mb per month), maybe 2 domains get 5-7gb traffic per month.
I monitor port 80 connections and rarely see more than 10 at a time.
That should in my opinion be no problem at all for a VPS with 768mb guaranteed ram and 2.4ghz cpu. I've got 30gb hard drive spare too.
But.... about 8 or 10 times a day it grinds to a complete halt: server load at 500-1000%, sites timing out, plesk takes 3mins to load, often I can't even connect with SSH, and the plesk web server, apache
INSERT INTO module_watchdog_sys_stat (time, type, value, service_id) VALUES(FROM_UNIXTIME(1226404705), 'MAINMEM_USAGE', 17472, 11);
80 seconds sounds like a huge amount of time for a MySQL insert to me! Does anyone know if this is likely to be the cause of my trouble? Some problem with Plesk and the database? Or could it be something else?
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May 17, 2007
Now that DNSReport is forcing logins/charging users for accounts does anyone know of any alternatives?
I can't seem to find anything remotely decent throughout my search engine hunts!
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Apr 15, 2009
At 15.00 PM (+1 hours here) my isp rebooted the hardware node. After the reboot there were some issues, they think it is possibly a DDoS Attack. They said the load on the host node was in the hunderds and my VPS was stopped because of the reboot and when I started it, HyperVM first told me it was not possible and after a few tries it started finally.
But the load was very high, and it still is. How can I check what the problem is that creates the high load?
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Nov 29, 2007
Im getting very poor ftp speeds from my server, can someone test the speed and report it back, link below:-
[url]
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Jun 20, 2007
I did nothing but my whole server got slower.
Especially the sshd and mc.
I solve the sshd problem cos I edited the conf file with UseDNS no so it faster right now but I couldnt do anything with mc.
I have to wait about 15 seconds to load it.
Any suggestion?
or any ideal why my server become slower?
System: Debian 4.0
kernel: grsec 2.6.19-1
Till today morning its okey.
Oh, yes, I run tiger and got the following message in log:
09:50> Beginning security report for atdn.us (GNU/Linux Linux 2.6.19.1-grsec).
# Performing check of passwd files...
# Checking entries from /etc/passwd.
--WARN-- [pass014w] Login (firebird) is disabled, but has a valid shell.
--WARN-- [pass016w] User oident has / as home directory
--WARN-- [pass015w] Login ID sshd does not have a valid shell
(/usr/sbin/nologin).
--WARN-- [pass015w] Login ID sync does not have a valid shell (/bin/sync).
# Performing check of PATH components...
--WARN-- [path009w] /etc/csh.login does not setenv an initial setting for
PATH.
# Only checking user 'root'
I modificated this to the correct one (I mean I try to solve this warnings) but when I noticed that my machine becmome slower, I recover everything.
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Jul 16, 2009
I have an ASP.Net + SQL Server 2008 Express website I was hosting with DiscountASP.net. Their service seems pretty solid, and I didn't have any issues hosting with them. Customer support was quick and knowledgeable.
However, I had noticed for quite some time that the website seemed pretty slow. Please note that the website isn't live yet, so it was only me and a colleague who were accessing it. I was accessing the website from Dubai, UAE and he from Doha, Qatar. Therefore traffic/load definitely wasn't the problem.
We tried an instance of the website on a VPS (the DB was still running on DASP), and it was blazing fast! The difference in speed was quite significant and sustained. What could the reason for this be? Is it because we can't expect good speeds from shared hosting? Or should I report this issue to DASP?
I would be paying around 5x of what I'm paying right now ($100 instead of $20) if I switched to a VPS, but if there are definite advantages, I would be willing to do so. I don't expect large volumes of traffic on the website for quite a while.
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May 22, 2009
I have a problem with my company's web hosting solution: occasionally we go through periods where we cannot seem to access our webpages very quickly. In different browsers (IE, Firefox) it takes literally minutes to load a single page. Most of the time the pages load very quickly from inside our office or outside.
Our self-hosting configuration is:
Windows XP Pro. w/ SP3
Apache 2.2.11 with PHP5.2.9-2
Norton Internet Security
Our internet connection is 10Mbps down / 900 kbps up cable behind a DLink router with port 80 forwarded over to the web server. Each page of our site is relatively small in size.
The same computer server as a mail server for about 10 email addresses.
When we encounter this problem, restarting the Apache service never seems to help, but restarting the computer does seem to help. XP was put on the computer with the latest updates about 3 weeks ago, so I am not concerned about spyware, particularly since this computer is only used as a server.
Does anyone have any troubleshooting steps to determine what the problem is? We don't have hundreds of visitors at a time in traffic as far as I am aware.
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Apr 28, 2009
I own the website [url]and it's hosted at Host Excellence. Recently there have been some downtime periods, and most importantly, I have noticed that downloads are very slow. For instance, when I download a file such as [url]I get an approximative transfer rate of 100-150 KB/sec (whereas most other sites download at 500 KB/sec or more). First of all I'd like to know if you guys get similar results, and what do you recommend? I have contacted my host about it, they seem to deny the problem. Should I switch? What to? I need something reliable and fast.
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Jan 6, 2009
After my bad experiences with the other provider, I decided to go with GeekStorage.com for my hosting needs. I found plenty of positive reviews for them but so far, it doesn't look good :-/
The support was fast enough, but not really helpfull.
My basic problems, so far, are:
1. The VPS is _really_ slow. Simple operations like listing (ls) the contents of directories with 4-5 files takes around 1~1.5seconds. Editing /etc/vim/vimrc with vim takes around 3 seconds (to open, I mean).
2. While trying to install phpmyadmin from the default ubuntu repository took me almost 10 minutes, from downloading to installing the packages. Something my old Dual P3 (yes, pentium 3) did in less than 2 minutes. Accessing the phpmyadmin page (with a web browser) took around 3 seconds, and no, I don't mean loading the database scheme and stuff, just the login screen. It just stood there for 3 seconds, then instant load. No, it wasn't a DNS problem. My browser was just hanging at "Waiting..."
3. Bandwidth is _really_ low. Tried downloading different files located all around the world and I never seen more than 300k/s, max. Sometimes it drops to a painfull 150k/s and just stays there.
4. Timeouts. First night they got my VPS up I had small downtime periods. I was trying to edit the DNS files and I had like 20 disconnects in 1 hour. The connection was working for 2 minutes, then *poof* dropped for another 2 minutes.
5. The virtualization. I can't install simple software as pureftpd. All I get is "Jan 4 20:38:21 vps pure-ftpd: (?@?) [ERROR] Unable to switch capabilities : Operation not permitted". Tried different workarounds (trying to avoid recompilation with --without-capabilities) but nothing worked.
As answers, all I got so far is:
- for the connection problem:
"Could you please provide the results of a traceroute when this problem is occurring? We will forward it to the DC and see if they can determine any network issues. Thank you, and apologies for the trouble."
Got the answer 1 hour after I asked them if there's something wrong, but it was too late... the problems were gone, for the moment.
- the slow response from the vps:
"2-3 seconds is understandable during peak hours, however we have not seen this issue come up on node3 since the server was rebooted recently. If the issues arise again
please let us know, we will check on the cause."
I *almost* understand about the peak hours, but it's not normal. I remember this was an issue with *shared* hosting. This was one of the reasons I got a VPS in the first place.
Basically they're telling me that during peak hours my customers will have to wait 3 seconds for my websites to load. You know what the average user does after waiting that many seconds for a page to load? Closes the browser or types another address.
I have the VPS512 plan (the $55 one + $3 safetyweb protection) + extra 50% bandwidth and disk space. My VPS is located on NODE3.
Anyone else experiencing the same issues (maybe on another node?) I'm still hoping for this issues to go away, maybe it's something temporary, but if this happens for the whole week, I'll definatelly ask for money back (they have a 60day return policy).
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Jul 28, 2009
My cPanel/WHM VPS is running slugesh/slow and loading time is affected, for cPanel/WHM and HTTP mainly PHP files.
VPS Spec:
CPU: 1 GHz * 4 cores
RAM: 832MB - Spare Ram 300MB+
Space: 35GB - Left 27GB
Load: Various but normally below 1.00
Is it in the UK, I am in the UK ping and trace route looks fine
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Dec 19, 2008
My site is very slow. But I can not find the reason.
Here is the top
Code:
top - 22:04:07 up 22:09, 1 user, load average: 0.44, 0.43, 0.34
Tasks: 402 total, 1 running, 401 sleeping, 0 stopped, 0 zombie
Cpu(s): 4.3%us, 0.7%sy, 0.0%ni, 94.8%id, 0.1%wa, 0.1%hi, 0.1%si, 0.0%st
Mem: 2074804k total, 2007836k used, 66968k free, 72720k buffers
Swap: 4192956k total, 96k used, 4192860k free, 641728k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
17133 apache 20 0 27752 9.9m 3392 S 4 0.5 0:02.25 httpd
6306 apache 20 0 27772 9.9m 3452 S 4 0.5 0:08.04 httpd
2261 mysql 20 0 251m 88m 4752 S 3 4.3 48:25.58 mysqld
17081 apache 20 0 27700 9.9m 3496 S 2 0.5 0:02.81 httpd
17105 apache 20 0 27112 9504 3428 S 2 0.5 0:02.62 httpd
11844 apache 20 0 27756 9.9m 3444 S 0 0.5 0:06.21 httpd
13676 apache 20 0 27700 9.9m 3440 S 0 0.5 0:04.74 httpd
13718 apache 20 0 27424 9856 3448 S 0 0.5 0:04.83 httpd
16690 apache 20 0 26628 8980 3408 S 0 0.4 0:01.88 httpd
When run
[root@nd10749 ~]# netstat -an |grep 80 |wc -l
2788
It was able to handle over 5000 connection without problem.
When checked the log, can not find anything suspicous.
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Oct 27, 2008
Leaseweb very very slow?
just me?
2 dedis... and both with problems... anyone?
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Aug 11, 2008
Recently, my server has been running real slow and I don't know why... I've not noticed any increase in traffic (In fact it goes slow with no traffic on it...), what are some things I can look at to try and diagnose the problem? I know next to nothing about *nix so please speak in great detail.
Anytime I restart Apache, it loads quick for a few seconds then gets slow again...
Here are the top few processes listed on the process manager: .....
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Jun 17, 2008
I had configured webserver on one of my CentOS server. It worked fine for few months but after sometimes it started giving problem. I was not able to browse website. The I found that it was timing out so I increased timeout period from php and the website started working.
But still the website is taking 30-35 seconds to load. I checked the server but I couldn't find any solution. Please guide me to get this resolved.
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Aug 2, 2008
I noticed today that SSH is taking longer to log into, I have tried by password and key but they just as slow as each other.
Once I am logged in, it is fine.
I have tried restarted SSHD via WHM but it makes no difference. Trace route looks ok and all other services seem fine as well.
Server load is around 0.00 and around 500mb ram spare.
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Apr 9, 2007
this is my server and i host only one site as upload image but it is too slow and usully apache down
how i can optimize this server please
Processor Information
Processor #1 Vendor: GenuineIntel
Processor #1 Name: Intel(R) Pentium(R) 4 CPU 2.26GHz
Processor #1 speed: 2262.422 MHz
Processor #1 cache size: 512 KB
Memory Information
Memory: 1002104k/1015744k available (2150k kernel code, 12844k reserved, 716k data, 164k init, 98240k highmem)
System Information
Linux 2.6.9-42.0.3.EL #1 Fri Oct 6 05:59:54 CDT 2006 i686 i686 i386 GNU/Linux
Physcial Disks
Current Memory Usage
total used free shared buffers cached
Mem: 1003164 976220 26944 0 102932 471740
-/+ buffers/cache: 401548 601616
Swap: 1052216 171412 880804
Total: 2055380 1147632 907748
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Oct 29, 2008
well i purchased a new dedicated server it has 4gb ddr2 ram and quad core Q6600 cpu.
and on 100mb shared. i havent even yet added any web site to it. but sometimes i get timeout when using whm. its hella slow :/ thats very strange and rare on new server.
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Jan 6, 2008
frends now iam haveing dedicated server with pentium-4 and RAM is 2GB,my site online members is more than 100 members,now i feel slow in server,what i have add extra RAM or any chage in server
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Jun 19, 2007
Why is my hosting server usually slow and down?
CPU Usage : 100%
Main : >3GB (total physical memory: 3GB)
i dont know Do user access to website that are hosted on my server too crowded make server slow while bandwidth only have 4MB.
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Nov 10, 2008
My account in bqbackup is very slow. Somebody here have the same issue?
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Jan 18, 2008
It was sent out mail at 7000 msgs/hr,
But it's only 900 msgs/hr.
Even I reboot the dedicated server, the speed is still slow.
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Jun 12, 2007
the FTP was goosed on a personal server before and I was on my way out with the bitch, so I decided to get PSM to sort it out for me.
Came back about 5 - 6 hours later and it hadnt been fixed. No problem though as I would just do it myself. Anyway just as I logged into SSH to get it done, they did it, cheers.
I wanted something enabling on the FTP at the request of a friend but wanted to watch some TV and as I can't seem to use the laptop and watch TV at the same time nowadays, decided to get PSM to do it (its only to enable resume on the FTP, so its a simple request).
Anyway to cut the story short, the ticket was submitted 6 hours 33 minutes ago and still no response. I wont do it myself now as I want to see how long it takes them to respond, it will be interesting as they have already failed to meet their 6 hour response guarantee.
Other then tonight I can't fault PSM, whenever I use them (which to be honest is maybe once every 5 months or so) they are great and usually very speedy, but tonight its just sooooo slow, its really unusual. Anyone else noticedc this slowness tonight?
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Apr 7, 2007
For those of you that complain about the slow loading speed of your sites due to being on over-loaded servers or over-sold bandwidth, why do you think that the discounted rate is worth the loss of customers that you might earn if your site loaded faster.
Have you ever given your sites a try on a quality host where your site loaded faster? You might be surprised at how much more effective your marketing was when surfers stay around long enough to see your site load.
Some times in the effort to secure such a great deal and save a penny, you wind up loosing a dollar, it might not make a difference to all of you but some will be surprised at the ROI for a bit better hosting!
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Sep 7, 2007
Server is dead slow. Its 3.0 1GB Ram Plesk Lniux Red Hat E4 machine. The top -c result is as below.
197 total, 6 running, 191 sleeping, 0 stopped, 0 zombie
Cpu(s): 4.0% us, 1.7% sy, 0.3% ni, 0.0% id, 94.0% wa, 0.0% hi, 0.0% si
Mem: 1027556k total, 953880k used, 73676k free, 23604k buffers
Swap: 2040244k total, 102308k used, 1937936k free, 87872k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3167 mysql 15 0 288m 67m 4336 S 0.8 6.8 40:37.97 /usr/libexec/mysqld --defaults-file=/etc/my.cnf --basedir=/usr --
3247 apache 18 0 125m 75m 4344 D 0.7 7.5 0:00.34 /usr/sbin/httpd
3039 root 26 10 13628 5808 2656 S 0.3 0.6 0:00.69 mytop
3250 apache 16 0 121m 71m 4520 R 0.3 7.1 0:00.35 /usr/sbin/httpd
4671 apache 15 0 141m 89m 6512 S 0.2 9.0 0:57.54 /usr/sbin/httpd
1882 popuser 15 0 4176 700 564 S 0.2 0.1 0:00.17 /usr/bin/pop3d Maildir
2111 popuser 15 0 4036 712 564 S 0.2 0.1 0:00.47 /usr/bin/pop3d Maildir
3327 apache 17 0 124m 73m 5556 R 0.2 7.3 0:00.50 /usr/sbin/httpd
1 root 16 0 3580 484 456 S 0.0 0.0 0:02.11 init [3]
2 root 34 19 0 0 0 S 0.0 0.0 0:14.01 [ksoftirqd/0]
3 root 5 -10 0 0 0 S 0.0 0.0 0:00.56 [events/0]
4 root 9 -10 0 0 0 S 0.0 0.0 0:00.00 [khelper]
5 root 15 -10 0 0 0 S 0.0 0.0 0:00.00 [kacpid]
19 root 5 -10 0 0 0 S 0.0 0.0 0:00.00 [kblockd/0]
40 root 10 -10 0 0 0 S 0.0 0.0 0:00.00 [aio/0]
20 root 15 0 0 0 0 S 0.0 0.0 0:00.00 [khubd]
39 root 15 0 0 0 0 S 0.0 0.0 4:09.01 [kswapd0]
186 root 25 0 0 0 0 S 0.0 0.0 0:00.00 [kseriod]
295 root 15 0 0 0 0 D 0.0 0.0 2:29.80 [kjournald]
1373 root 6 -10 2272 376 372 S 0.0 0.0 0:00.02 udevd
1606 root 6 -10 0 0 0 S 0.0 0.0 0:00.00 [kauditd]
1648 root 6 -10 0 0 0 S 0.0 0.0 0:00.00 [kmirrord]
1672 root 15 0 0 0 0 S 0.0 0.0 0:00.00 [kjournald]
1673 root 19 0 0 0 0 S 0.0 0.0 0:00.00 [kjournald]
2443 root 15 0 1608 528 456 D 0.0 0.1 2:14.13 syslogd -m 0
2447 root 16 0 2696 368 316 S 0.0 0.0 0:00.00 klogd -x
2474 rpc 15 0 3304 404 400 S 0.0 0.0 0:00.00 portmap
2493 rpcuser 18 0 2648 528 524 S 0.0 0.1 0:00.00 rpc.statd
2519 root 16 0 4672 188 152 S 0.0 0.0 0:00.10 rpc.idmapd
2590 root 15 0 1952 436 284 S 0.0 0.0 0:00.07 /usr/sbin/smartd
2599 root 19 0 1940 356 352 S 0.0 0.0 0:00.00 /usr/sbin/acpid
2659 named 16 0 43736 7664 1884 S 0.0 0.7 12:22.15 /usr/sbin/named -u named -c /etc/named.conf -u named -t /var/name
2702 root 16 0 4956 912 792 S 0.0 0.1 0:03.86 /usr/sbin/sshd
2715 root 16 0 3104 712 620 S 0.0 0.1 1:02.87 xinetd -stayalive -pidfile /var/run/xinetd.pid
2869 postgres 16 0 19772 1440 1332 S 0.0 0.1 0:00.08 /usr/bin/postmaster -p 5432 -D /var/lib/pgsql/data
2873 postgres 18 0 10572 216 176 S 0.0 0.0 0:00.00 postgres: stats buffer
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