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  • Postgresql connection refused

    - by Jonathan
    I'm trying to remotely connect to my postgresql database. I have two virtual machines set up both running ubuntu 14.04. I am trying to connect to the second vm using the first vm using psql -h 10.0.1.23 -U postgres -d postgres But I receive the error: Could not connect to server: Connection refused Is the server running on host "10.0.1.23" and accepting TCP/IP connections on port 5432? I have changed the pg_hba.conf and added host all all 10.0.1.64/24 md5 host all all * md5 host all all 0.0.0.0/0 md5 And changed the postgresql.conf listen_address=" * " In an attempt to allow all incoming connections. I have also tried to change the firewall settings, but I am unsure of whether or not the ports are properly listening for the connection. Edit: Output of netstat -an | grep -E '^tcp[^6].*LISTEN' tcp 0 0 127.0.1.1:53 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:23 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:5432 0.0.0.0:* LISTEN

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  • How to change mount to grant user write permissions?

    - by nals
    I am on TomatoUSB, and using the feature to have a NAS. The only way I can write to the Samba share is if I force root: [global] interfaces = 127.0.0.1, 192.168.1.1/24 bind interfaces only = no workgroup = WORKGROUP netbios name = TOMATO security = share wins support = yes name resolve order = wins lmhosts hosts bcast guest account = nobody [Public] path = /mnt/sda2 read only = no public = yes only guest = yes guest ok = yes browseable = yes comment = Network share force user = root writeable = yes I dont really like the idea having to use root to allow write access to my share. I have a samba account created already named nobody to allow access to the share. However every time I try to write I get access denied error. fstab: /dev/sda2 /mnt/sda2 vfat defaults 0 0 Further more every time I try to chmod 777 /tmp/mnt/sda2 the permissions are not changed, and no error is produced. They stay 755. drwxr-xr-x 2 root root 4096 Jun 4 01:49 sda2 Basically; how can I give the user nobody write permissions to my mount? dev name: /dev/sda2 dev mount: /tmp/mnt/sda2

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  • Converting flv and mp4 video format to '.ogg' using FFmpeg

    - by user163906
    I have HostGator VPS server with FFmpeg installed. It allows me to convert .wmv to .flv as well as .mp4 files successfully using the following commands for flv and mp4: ffmpeg -i WantsABath.wmv -b 600k -r 24 -ar 22050 -ab 96k WantsABath.flv ffmpeg -i WantsABath.wmv WantsABath.mp4 but it won't allow me to convert any file format to .ogg. I tried using the command: ffmpeg -i input.mp4 -acodec libvorbis -vcodec libtheora -f ogv output.ogv by mondain but no luck with it. I am doubting that my VPS doesn't have libtheora installed. I tried configuring it by using SSH but I don't know how to make sure if it is installed or not. I tried checking with php_info but can't find anything regarding libtheora. Here's my FFmpeg version: FFmpeg version SVN-r19795, Copyright (c) 2000-2009 Fabrice Bellard, et al. configuration: --enable-libmp3lame --enable-libvorbis --disable-mmx --enable-shared --prefix=/usr/ --enable-gpl libavutil 50. 3. 0 / 50. 3. 0 libavcodec 52.35. 0 / 52.35. 0 libavformat 52.38. 0 / 52.38. 0 libavdevice 52. 2. 0 / 52. 2. 0 libswscale 0. 7. 1 / 0. 7. 1 This details doean't show libtheor Can anyone please suggest me something?

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  • Why am I seeing Zero errors in non-ECC RAM?

    - by Alexander Shcheblikin
    According to sources, memory errors are a very probable event: Some say the probability of a DRAM error is 95% in just 3 days of operation of a computer with just 4 GB of RAM, others say 32% of servers experience at least one error in a month with 8% of DIMMs being at fault. Contrary to those horrors, in my more than 10 years of personal computers use I have seen exactly none of the memory errors. I admit I never paid special attention to the subject. However, I have ventured multi-hour memtest86 runs couple of times and never seen an error either. Some of the factors that IMO should aggravate the memory problems: I build my computers out of the most "bulk commodity" parts: mainstream budget motherboards and the next to cheapest memory. also I usually max out the technology available, e.g. in the times of 32 bit OS'es I used 4 GB of RAM and with the current desktop CPUs and the newer 64 bit OS'es I use 32 GB of RAM. memory usage is moderately heavy with lots of virtual machines up running small and big tasks 24/7/365. But nevertheless, no memory-related problems ever found! How's that?

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  • bind would not work unless allow-query is "any"

    - by adrianTNT
    I have this in /etc/named.conf, I commented the default values and set my own under it. My domain would not load in browser unless I set allow-query to "any", is this OK, what should I edit? If is localhost or 127.0.0.1; 10.0.1.0/24; domain would not load. I tried the 127.. thing because it mentioned it here: http://wiki.mandriva.com/en/Testing:Bind Bind version is 9.7.0-P2-RedHat-9.7.0-5.P2.el6_0.1 OS is CentOS 6.0. options { // listen-on port 53 { 127.0.0.1; }; listen-on port 53 { any; }; //listen-on-v6 port 53 { ::1; }; listen-on-v6 port 53 { any; }; directory "/var/named"; dump-file "/var/named/data/cache_dump.db"; statistics-file "/var/named/data/named_stats.txt"; memstatistics-file "/var/named/data/named_mem_stats.txt"; //allow-query { localhost; }; allow-query { any; }; recursion yes; dnssec-enable yes; dnssec-validation yes; dnssec-lookaside auto; /* Path to ISC DLV key */ bindkeys-file "/etc/named.iscdlv.key"; };

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  • Email delivering but not receiving from Gmail

    - by Karthik Malla
    Host Record type Value 65.75.241.26 / 24 PTR softmail.me. accs.softmail.me. A 65.75.241.26 beta.softmail.me. A 65.75.241.26 ftp.softmail.me. CNAME softmail.me. lists.softmail.me. CNAME softmail.me. mail.softmail.me. A 65.75.241.26 mssql.softmail.me. A 65.75.241.26 ns.softmail.me. A 65.75.241.26 sitebuilder.softmail.me. A 65.75.241.26 softmail.me. NS ns.softmail.me. softmail.me. A 65.75.241.26 softmail.me. MX (10) mail.softmail.me. test.softmail.me. A 65.75.241.26 webmail.softmail.me. A 65.75.241.26 www.accs.softmail.me. CNAME accs.softmail.me. www.beta.softmail.me. CNAME beta.softmail.me. www.softmail.me. CNAME softmail.me. www.test.softmail.me. CNAME test.softmail.me. The above are the DNS settings of my email server and mail incoming/outgoing is done by softmail.me:25/110 using which I am able to send emails but unable to receive. Can anyone tell me where the problem lies at?

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  • Problem mirroring two monitors with different resolution

    - by quad
    Hello I am trying to put two monitors in mirror mode (Windows 7 Professional) with Ultramon 3.1.0. The two monitors: Main monitor: 24" Asus. 1680x1050 resolution (16/10). Secondary monitor: 19" LG. 1280x1024 resolution. The graphic card is a Nvidia GeForce 8600 GT. I have installed the Ultramon 3.1.0 and I have created a mirror, with the "stretch mirror image to fill monitor" and the "disable video overlays and 3D acceleration". When I start the mirroring, there are two zones in the lateral edges that are not displayed in the second monitor. I think this is because the width of the main monitor is 1680 px. and the width of the secondary monitor is 1280 px., but I have indicated "stretch mirror image to fill monitor" in the options. The same occurs in the top and the bottom edges, but the diference is minimal (1050 vs 1024 pixels). I want the same image (distortioned in the secondary monitor if is neccesary), but I don't know what is failing. Someone can help me, please? I have read Mirrored monitors of different resolution. Cloned screen on monitors with different resolutions

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  • Imagemagick convert creates monochrome output only

    - by rumtscho
    I have a book scan as a pdf. When I open it with Adobe Reader, it looks like grayscale. When I open it with IrfanView, it looks like grayscale, and the Information option tells me that the image is actually 24 bit (I don't know if this is the real bit depth of the image embedded in the pdf or if IrfanView assigns the maximal depth when opening a pdf as image). I want to OCR the scan with OmniPage SE. It doesn't read PDF, so I decided to use ImageMagick to convert the file to PNG first. But no matter what I try, the output is always monochrome and practically unreadable. I tried different conversion lines, with different depth, density and resize values, but it didn't help. What you see was made with the options convert testfile.pdf -density 600x600 -depth 8 PNG:testfile.png. Any idea what causes the problem? Edit: To make it clear, the output looks like this for any value of -density, -depth and -resize I have tried. It also looks like that when I use no options at all, as in convert testfile.pdf PNG:testfile.png.

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  • Converting a Windows 2003 server

    - by Jim Bass
    We have a legacy database system based upon MS SQL running on Windows Server 2003. The client software will only run on Windows XP. We have recently had success converting a client into a virtual machine and running it under Fusion on Mac minis. So far, it is working incredibly well. So well, in fact, that we are now considering trying to convert the server to a virtual machine. This raises several questions, though: 1. The server uses a raid array. Does the VM virtualize the raid array? I only ask because in my experience Windows products don't like it when you change core hardware. 2. Is there any reason why running SQL server on a virtual machine won't work? It will be up 24/7. 3. Is there a different converter for servers? 4. Will I have to track down the licensing for MS SQL and Server 2003 or will they come across ok? 5. The company that designed the software is no longer in business. There is some fear that the software is somehow tied to the hardware configuration. We bought the hardware, but their engineers came out and configured the system. Will the virtual machine be able to spoof particular chip sets? Thanks! Jim Bass

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  • What exactly is a Deamon ? ( how to run a root command from apache binded script that uses www-data user )?

    - by user224235
    I am trying to run this command from WSGI script service httpd restart The problem is this command can only be run by root and apache uses the www-data user. it has been said the solution is to use a Deamon Process i suppose the idea is to send the command to a file that will be executed by a script that is considered "root" user.. its difficult to understand why they would call this a Deamon Process and try to scare me. Perhaps it should have been called : proxy process when i got the idea that this was a proxy process.. i thought about adding a line to /var/spool/cron/root that way the cron would execute the command for me. but of course this means i have to get the system time and then add 1 second to it and then add it to that line so cron would execute the command for me as root but my script demands an output instantly. so i suppose i need to create a DEAMON PROCESS that works like the cron. in other words it is a bash file that will execute the command in a plain file.. but will this DEAMON PROCESS be running a while command 24/7 every second ? would that not waste resources ? it only needs to activate itself to check for a command to execute when there is a command to be executed. i mean in PHP and other programming languages.. running a while statement when there is nothing to be executed could waste resources of the server.. so why should a deamon process constantly be listening for anything. i only want it to listen and execute when it is needed. i do not need a process that is constantly listening.

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  • Mac OS X: Update Python for Shell

    - by Nathan G.
    So, I see similar questions, but none of the answers work for me. I updated Python to 3.1.3 from 2.6.1. Everything works, except: When I type python into Terminal, I get: Python 2.6.1 (r261:67515, Jun 24 2010, 21:47:49) [GCC 4.2.1 (Apple Inc. build 5646)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> So, how do I change the version of Python that runs in the Shell? I've tried the script that they provide. It adds their directory to my $PATH, but it still doesn't change the version that'd displayed from Terminal. Here's what I get when I echo $PATH: /Library/Frameworks/Python.framework/Versions/3.1/bin:/Library/Frameworks/Python.framework/Versions/3.1/bin:/Library/Frameworks/Python.framework/Versions/3.1/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin It appears that the script provided has added their directory for every time I ran the script (I tried it a few times, naturally). I'll gives links to caps of what is in the other relevant folders it mentions: /Library/Frameworks/Python.framework/Versions/3.1/bin /usr/local/bin /usr/bin Thakns in advance for any ideas!

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  • Did my registrar screw up or is this how name server propagation works?

    - by Brad
    So my company has a number of domains with a large registrar that shall go unnamed. We are making some changes to our DNS infrastructure and the first of those is we are moving our secondary DNS from one server on site to four servers offsite. So we updated the name servers for each domain at the registrar by removing the entry for the old secondary name server and adding the four new ones. I monitored the old secondary server for requests and when I saw no new requests had been made for 24 hours I shut it down. That was this morning. I assumed at this point everything was good. Unfortunately this was my mistake. I should have gone and made sure name servers at large were returning the correct NS records. So this afternoon we were performing maintenance on our primary DNS server and we shut it down. This is when I started getting alerts from our external monitoring. I checked and sure enough, the DNS server used there reported the only NS record for our primary domain was the primary name server. The new secondary servers were not listed and neither was the old secondary. Is it unreasonable of me to have assumed that because the update was from ns1.mydomain.com ns2.mydomain.com to ns1.mydomain.com ns1.backupdns.com ns2.backupdns.com ns3.backupdns.com ns4.backupdns.com in one step at the registrar that there should be no intermediate state where the only NS record was for ns1.mydomain.com? Going forward to be safe obviously I will always leave the old name servers alone until after I'm 100% sure the new ones have propagated and only then remove the old name servers from the registrar. However, I'd still like to know if my registrar screwed up or if my expectation was unreasonable.

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  • How to configure network on Windows Server 2008

    - by Gokhan Ozturk
    I have a IBM x3400 Server Machine with Windows Server 2008 R2 installed on it. But, since I am not expert on networking I have some problems. These roles installed on my server: Active Directory DNS File Sharing Hyper-V ISS VPN There is two network card on them. I configured them like this: Local Connection 1: 192.168.30.3 255.255.255.0 192.168.30.2 127.0.0.1 Local Connection 2: 192.168.30.101 255.255.255.0 192.168.30.6 127.0.0.1 My problem is, when I use this Ip gateways, It is sharing internet to all computers. This is not I want. I want to use Local Connection 1 for internal network. I am giving all computers gateway and DNS IP as 192.168.30.3 The Local Connection 2 is for Hyper-V and VPN connections. 192.168.30.2 and 192.168.30.6 are my modem's gateways. I am using 192.168.30.6 external IP for VPN connections. There is two 24 port switches. There is a connection between them and this two ethernet card connected directly to them. And modems are connected to switches as well (Morems are not near the server. They are somewhere in the building). I disabled network Bridge and removed all ethernet cards from it. With this configuration, all computers can ping my server's IP (192.168.30.3) but on server I cannot ping any clients (Request timeout). What is the best way to configure my network? Thank you. Redgards

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  • How to implement a virtual server running Ubuntu inside a fileserver in windows?

    - by user541445
    I work in a company that has some limitations regarding their budget. They need client/server aplication. I can code the aplication, I've made mini tests on primordial applications that work. The thing is that they only have fileservers, and the application they need must be concurrent compliant, so the database must be in their local network (Fileserver is the only choice). So far, I have explored almost any option available, starting with: Desktop databases. Access (We have a license)(But concurreny is just not effective, besides it's a windows software, yuck). Sqlite (Nice, but since the information they manage is a lot, I've performed some concurrency tests with INSERTs and doing SELECTS at the same time). It fails, somehow it just stops inserting. Open office Base (I dismember a base office only to see that it was a file mode HSQLDB). I've tried, not concurrent at all. Etc (You name the Open source Desktop Database manager, and yes, I've tried that one.) Server databases Call me a stubborn person, but reading some server databases documentation say that their databases will work in a file mode. I've tried a lot of products. Postgres, MySQL, FireBird, H2, Derby, Oracle Express, IBM DB2 Express, etc. So, I really need a hand here, I've been doing this install/delete/depression thing with a lot of databases for 3 weeks, until I got with a crazy idea and I just came here to express it. So, my question comes down to this: Installing a light virtual OS software like Virtual PC and then installing in there a Server OS like an Ubuntu server inside that virtual software will work? Will it work 24/7 or when I close the virtual pc software? Will this work in a fileserver? Any suggestion, answer, critic to the place I work, crazy new concurrent database that will work in fileserver will be most than welcome.

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  • File permission woes on an Ubuntu ec2 instance

    - by Pardoner
    I've set up an amazon ec2 instance and I'm have some file permission issues. I've created myself a new user and added myself to the following groups: adm:x:4:me,ubuntu sudo:x:27:me www-data:x:33:me,www-data ssh:x:108:me admin:x:111:me ubuntu:x:1000:www-data,me me:x:1001:me but when I cd /var/www I can't do simple commands without doing sudo. So I chown -R www-data:www-data /var/www to ensure that I'm in the owning group but I still have to type sudo for everything. If I sudo su www-data it works fine. Since I'm in the www-data group shouldn't I have the same privilages as www-data? One strange thing I'm noticing is that when I ls -l it list the owner but not the group names. Could this possibly be part of the issue? Is is posible for a directory to not be part of a group? drwxr-xr-x 4 www-data 4.0K Oct 24 16:39 . drwxr-xr-x 14 root 4.0K Oct 10 16:58 .. drwxrwxr-x 9 www-data 4.0K Oct 23 04:03 admin.mywebsite.com drwxrwxr-x 2 www-data 4.0K Oct 4 00:29 mywebsite.com drwxrwxr-x 9 www-data 4.0K Oct 23 04:03 staging.mywebsite.com Edit : It appears I had some alias messing with my ls command. By calling \ls -l I can see that all my files are in the correct group.

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  • Google Chrome is running my system out of memory

    - by jasondavis
    I am running Windows 7 x64 with 12GB of RAM I often have multiple windows and a ton of tabs open. I use the extension Session Buddy to restore all my windows and tabs once the memory gets too high. So my 12gb of ram will get up to around 93% used because of Chrome, now I can close chrome down and restore the same amount of windows and tabs and it will only use about 25% of memory, it then over time increases back up to the 90% zone after several hours. It seems that when I close tabs, instead of freeing that memory up, it doesn't so that is why the huge increase of memory usage as new tabs are opened and closed it just adds up, this sounds like a huge bug in chrome. Just for an example I just re-booted my system, I only have 1 window with 4 tabs open and in the task manager, it shows 29 chrome.exe processes I then killed all chrome processes and opened a chrome window with just 1 tab, it made 27 chrome.exe processes. Is this an issue that others have? More importantly, is there a fix? UPDATE I just read that each plugin and extension creates a chrome.exe process, I then couunted 24 extensions so that helps explain a portion of the large processes. Still not sure about memory not being freed up though!

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  • VirtualBox doesn't see raw partitions

    - by smbear
    What I want to achieve is to set up virtual machine with VirtualBox. Host OS is Windows 7 Home Premium, guest will be (k)Ubuntu 12.04 on a raw partition. The first problem is that when I issue following command: VBoxManage.exe internalcommands listpartitions -rawdisk \\.\PhysicalDrive0 I get following result: Number Type StartCHS EndCHS Size (MiB) Start (Sect) 1 0xee 0 /0 /1 1023/254/63 715404 1 I'm guessing that VirtualBox is unable to see my partitions. If I use diskpart tool, then all partitions are listed correctly (note Polish language version of Windows): DISKPART> select disk 0 Obecnie wybranym dyskiem jest dysk 0. DISKPART> list partition Partycja ### Typ Rozmiar Przesuniecie ------------- ---------------- ------- ------------ Partycja 1 System 200 MB 1024 KB Partycja 2 Zarezerwowany 128 MB 201 MB Partycja 3 Podstawowy 139 GB 329 MB Partycja 5 Nieznany 4883 KB 140 GB Partycja 6 Podstawowy 50 GB 140 GB Partycja 7 Podstawowy 484 GB 190 GB Partycja 4 Odzyskiwanie 24 GB 674 GB Additional note: my PC is using EFI to boot OS. Basing on the results listed above, I believe that: I messed up with my partition table. Something is wrong with VirtualBox. Can anyone help with this issue?

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  • do I need to create an AD site for VPN network

    - by ykyri
    I have Windows Domain level 2008 R2. There are four GC DC in four different physical locations. I have Kerio-based VPN network for replication and remote administration. Here is how network configured: dc1: local IP: 192.168.0.10 VPN IP: 192.168.1.10 dc2: local IP: 10.10.8.11 VPN IP: 192.168.1.11 dc3: local IP: 10.10.9.12 VPN IP: 192.168.1.12 dc4: local IP: 10.10.10.13 VPN IP: 192.168.1.13 That's simple, replication and all works fine but when running dcdiag on dc3 I have an error: A warning event occurred. EventID: 0x000016AF During the past 4.12 hours there have been 216 connections to this Domain Controller from client machines whose IP addresses don't map to any of the existing sites in the enterprise. <...> The log(s) may contain additional unrelated debugging information. To filter out the needed information, please search for lines which contain text 'NO_CLIENT_SITE:'. The first word after this string is the client name and the second word is the client IP address. Here is netlogon.log lines example: 05/30 12:07:39 DOMAIN.NAME: NO_CLIENT_SITE: dc2 192.168.1.11 05/31 09:52:11 DOMAIN.NAME: NO_CLIENT_SITE: dc4 192.168.1.13 05/31 19:49:31 DOMAIN.NAME: NO_CLIENT_SITE: adm-note 192.168.1.101 07/01 05:16:26 DOMAIN.NAME: NO_CLIENT_SITE: dc1 192.168.1.10 All VPN-joined computers are generates same log line as above. Computer amd-note is for example administrator's notebook, also have VPN. Question is should I add new AD site and bind VPN subnet 192.168.1.0/24 with that site?

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  • explanation of RAM specs, and what do I need for a Gaming rig

    - by ewok
    I am looking into upgrading my custom built PC's RAM. I use the machine mostly for gaming, but I don't really know a ton about RAM, so I wanted to ask a few questions. The research I've done tells me there is a negligible increase in speed for anything above 1600 MHz. is this true or is it worth the extra money to go higher? Other than drawing more power from the PSU, is there any real difference in performance with different voltages (1.5V vs 1.65V)? most of the kits I've found in the 2x4 1600 range have a CAS latency of 9 and timing of 9-9-9-24. For a significant increase in price (usually about 1.5x), I can get either 8 or 7 and lower timing. Is it worth the cost? What I am looking for here is someone to give a good explanation of what the different specs represent, and how that relates to the performance of the machine. Specifically, I'm looking for what specs I need to focus on for a good gaming rig. I am NOT looking for a "buy this, it's the best RAM" without an explanation of why. The information will be much more valuable as it will allow me to make my own informed decision. As they say, give a man a fish, he'll eat for a day. teach a man to fish, and he'll eat for the rest of his life.

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  • Server slowdown

    - by Clinton Bosch
    I have a GWT application running on Tomcat on a cloud linux(Ubuntu) server, recently I released a new version of the application and suddenly my server response times have gone from 500ms average to 15s average. I have run every monitoring tool I know. iostat says my disks are 0.03% utilised mysqltuner.pl says I am OK other see below top says my processor is 99% idle and load average: 0.20, 0.31, 0.33 memory usage is 50% (-/+ buffers/cache: 3997 3974) mysqltuner output [OK] Logged in using credentials from debian maintenance account. -------- General Statistics -------------------------------------------------- [--] Skipped version check for MySQLTuner script [OK] Currently running supported MySQL version 5.1.63-0ubuntu0.10.04.1-log [OK] Operating on 64-bit architecture -------- Storage Engine Statistics ------------------------------------------- [--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster [--] Data in MyISAM tables: 370M (Tables: 52) [--] Data in InnoDB tables: 697M (Tables: 1749) [!!] Total fragmented tables: 1754 -------- Security Recommendations ------------------------------------------- [OK] All database users have passwords assigned -------- Performance Metrics ------------------------------------------------- [--] Up for: 19h 25m 41s (1M q [28.122 qps], 1K conn, TX: 2B, RX: 1B) [--] Reads / Writes: 98% / 2% [--] Total buffers: 1.0G global + 2.7M per thread (500 max threads) [OK] Maximum possible memory usage: 2.4G (30% of installed RAM) [OK] Slow queries: 0% (1/1M) [OK] Highest usage of available connections: 34% (173/500) [OK] Key buffer size / total MyISAM indexes: 16.0M/279.0K [OK] Key buffer hit rate: 99.9% (50K cached / 40 reads) [OK] Query cache efficiency: 61.4% (844K cached / 1M selects) [!!] Query cache prunes per day: 553779 [OK] Sorts requiring temporary tables: 0% (0 temp sorts / 34K sorts) [OK] Temporary tables created on disk: 4% (4K on disk / 102K total) [OK] Thread cache hit rate: 84% (185 created / 1K connections) [!!] Table cache hit rate: 0% (256 open / 27K opened) [OK] Open file limit used: 0% (20/2K) [OK] Table locks acquired immediately: 100% (692K immediate / 692K locks) [OK] InnoDB data size / buffer pool: 697.2M/1.0G -------- Recommendations ----------------------------------------------------- General recommendations: Run OPTIMIZE TABLE to defragment tables for better performance MySQL started within last 24 hours - recommendations may be inaccurate Enable the slow query log to troubleshoot bad queries Increase table_cache gradually to avoid file descriptor limits Variables to adjust: query_cache_size (> 16M) table_cache (> 256)

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  • Slow tracepath on local LAN

    - by Simone Falcini
    I am on EXSi and I have 2 instances: Ubuntu and CentOS. These are the network configurations Ubuntu eth0 Link encap:Ethernet HWaddr 00:50:56:00:1f:68 inet addr:212.83.153.71 Bcast:212.83.153.71 Mask:255.255.255.255 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:76059 errors:0 dropped:26 overruns:0 frame:0 TX packets:7224 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:6482760 (6.4 MB) TX bytes:2080684 (2.0 MB) eth1 Link encap:Ethernet HWaddr 00:0c:29:46:5a:f2 inet addr:192.168.1.1 Bcast:192.168.1.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:252 errors:0 dropped:0 overruns:0 frame:0 TX packets:608 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:42460 (42.4 KB) TX bytes:82474 (82.4 KB) /etc/iptables.conf *nat :PREROUTING ACCEPT [142:12571] :INPUT ACCEPT [5:1076] :OUTPUT ACCEPT [8:496] :POSTROUTING ACCEPT [8:496] -A POSTROUTING -s 192.168.1.0/24 -o eth0 -j MASQUERADE COMMIT *filter :INPUT ACCEPT [2:72] :FORWARD ACCEPT [4:336] :OUTPUT ACCEPT [6:328] -A INPUT -i eth1 -p tcp -j ACCEPT -A INPUT -i eth1 -p udp -j ACCEPT -A INPUT -i eth0 -p tcp --dport ssh -j ACCEPT COMMIT CentOS eth0 Link encap:Ethernet HWaddr 00:0C:29:74:1C:55 inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::20c:29ff:fe74:1c55/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:499 errors:0 dropped:0 overruns:0 frame:0 TX packets:475 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:68326 (66.7 KiB) TX bytes:82641 (80.7 KiB) The main problem is that if i execute this command from the CentOS instance ssh 192.168.1.2 it takes more than 20s to connect. It seems like it's routing the connection to the wrong network. What could it be? Thanks!

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  • How to set a static route for an external IP address

    - by HorusKol
    Further to my earlier question about bridging different subnets - I now need to route requests for one particular IP address differently to all other traffic. I have the following routing in my iptables on our router: # Allow established connections, and those !not! coming from the public interface # eth0 = public interface # eth1 = private interface #1 (10.1.1.0/24) # eth2 = private interface #2 (129.2.2.0/25) iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A INPUT -m state --state NEW ! -i eth0 -j ACCEPT iptables -A FORWARD -i eth0 -o eth1 -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A FORWARD -i eth0 -o eth2 -m state --state ESTABLISHED,RELATED -j ACCEPT # Allow outgoing connections from the private interfaces iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT iptables -A FORWARD -i eth2 -o eth0 -j ACCEPT # Allow the two private connections to talk to each other iptables -A FORWARD -i eth1 -o eth2 -j ACCEPT iptables -A FORWARD -i eth2 -o eth1 -j ACCEPT # Masquerade (NAT) iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE # Don't forward any other traffic from the public to the private iptables -A FORWARD -i eth0 -o eth1 -j REJECT iptables -A FORWARD -i eth0 -o eth2 -j REJECT This configuration means that users will be forwarded through a modem/router with a public address - this is all well and good for most purposes, and in the main it doesn't matter that all computers are hidden behind the one public IP. However, some users need to be able to access a proxy at 192.111.222.111:8080 - and the proxy needs to identify this traffic as coming through a gateway at 129.2.2.126 - it won't respond otherwise. I tried adding a static route on our local gateway with: route add -host 192.111.222.111 gw 129.2.2.126 dev eth2 I can successfully ping 192.111.222.111 from the router. When I trace the route, it lists the 129.2.2.126 gateway, but I just get * on each of the following hops (I think this makes sense since this is just a web-proxy and requires authentication). When I try to ping this address from a host on the 129.2.2.0/25 network it fails. Should I do this in the iptables chain instead? How would I configure this routing?

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  • SSD for swap on Ubuntu server

    - by grs
    Currently I am reading SSD reviews and I wonder how much exactly I will benefit if I move the 24 GB swap from 7200rpm HDD to SSD. Does anyone implemented swap space on SSD? Is this generally good idea? On a side note: I read that ext4 has much better performance if the journal is on SSD. Anyone with such a setup? Thanks! Edit: Here I will answer the questions posted: Occasionally, relatively rare I am hitting the swap. I know what the swap is for and that is better to get more RAM. When the server begins to swap its performance degrades (not a surprise). The idea is if I have few memory hungry processes running, to improve the overall system performance at that time, using SSD for swap, instead of slower rotational media. At the end - I want to be able to login faster and check the server state during swapping, instead of waiting on the login prompt. And of what I see SSD is cheaper per GB than RAM. Would I have better server performance during swapping (as rare it is) using SSD compared to HDD? Where 10k or 15k rpm HDDs would rate in this scenario? Thank you all for your quick and prompt answers!

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  • Would an array of SSD drives be able to succesfully substitute the system memory?

    - by Florin Mircea
    I watched a few videos trying to answer this. This video (youtube.com/watch?v=eULFf6F5Ri8) shows a bunch of guys stacking 24 SSD's reaching a peak of around 2GBps r/w. That's under the limit of the worst DDR3 in this list (memorybenchmark.net/write_ddr3_amd.html) - that shows DDR3 memory performance varying from 2.78 to 6.55 Gb per second, but that video is over 3 years old. This video (youtube.com/watch?v=27GmBzQWwP0) shows a more optimistic situation, but for PCI-E SSD drives: 5 drives peaking at around 4Gb. And this other video shows that stacking up more than 3 SSD's doesn't realistically offer a substantial added performance. This and the fact that in all benchmarks the drives act quite poorly when dealing with small files (5k file read/write averaging from 10MB to around 30-40MBps) as opposed to how native memory handles such files, seems to indicate a definite NO to this question. Also, the write life cycle is indeed limited and the drives might wear out quickly, as kindly pointed out by paddy. However, I wanted to get more opinions on this. Would it be possible to at least obtain current memory performance with SSD's in RAID 0? And if so, in what circumstances? I am assuming using this configuration with a Windows OS that has a memory pagefile resident to that stack of SSD's, thus making it very fast to work with.

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  • Discover the public ip of a network without being connected

    - by Martin Trigaux
    Let say, I'm next to a network and can see the traffic (with airodump or similar tool) but can not decipher it (because I am not connected on the network). Is it possible to discover the public ip address of the network ? I know the MAC address of the users connected on the network but do I know the one of the router ? If yes, maybe there is a way to do the matching. I know IP addresses are not forever but some addresses are static and never change. Maybe there is a database of MAC address having recorded that. Google has a database that match MAC address and geographical coordinates so why not with IP addresses ? Other idea, if I know where am I, I can maybe guess the IP range used in the city by the ISP (is it findable ?) and then try to "ping" each IP on the range (if it is a /24, it's possible, even /16 maybe). Will I get some information like the MAC of the box or see some traffic on the network ? These are two ideas I had. I don't know if they are doable, certainly not perfect. Do you think of some others ? By trying several methods, maybe I can get a guess with a bit of luck. Thank you

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