- WLUG - wlug.mailman3.com

pubkey authentication in openssh
by Eric Stein 17 Feb '06

17 Feb '06

Does anyone know a way to force pubkey authentication for only certain users but allow password for others? Eric

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MySQL replication question
by Bill Mills-Curran 17 Feb '06

17 Feb '06

Does anyone have experience with MySQL's replication capabilities? I'm running versions 4.1.8 and 4.1.14 servers on linux and windows, and I have a very remote site where I'd like to support replication. The data changes very slowly, but the link has 300 ms (ping) latency and has a small (but noticeable) amount of down time. Does it work well enough to be considered reliable for critical applications? TIA, Bill

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Reminder: Upcoming WLUG meeting THURSDAY 7:00 PM
by Andy Stewart 14 Feb '06

14 Feb '06

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 HI Everybody, Its that time again! The next WLUG meeting will be on Thursday, February 16th at 7:00 PM in the Access Grid Room at WPI in Worcester, MA USA. Directions can be found on the WLUG website. At this meeting, yours truly will give a presentation about getting Linux running on the MikroTik Routerboard 532. I had decided that I wanted to build a silent firewall, no moving parts, running GPL'd software. I used buildroot and Busybox from the embedded Linux world, the Linux kernel (with patches), and the SuSE Firewall scripts, to make a working firewall. The firewall has been up for 13.5 days straight with no discernable problems. It passed a recent screening by nessus. Linux firewall 2.4.30 #12 Sun Jan 22 20:31:58 EST 2006 mips unknown 21:56:47 up 13 days, 12:46, load average: 0.00, 0.00, 0.00 I'll bring the box to the meeting and use it in a live demo. I'll have some slides on my laptop as well, which I'll post on the WLUG website afterwards. I also have some items for raffle: 1 Linux Journal magazine from March 2006 (they sent me 2...) Cross Platform GUI Programming with wxWidgets Bruce Perens' Open Source Series Prentice Hall ISBN 0-13-147381-6 Linux Patch Management Bruce Perens' Open Source Series Prentice Hall ISBN 0-13-236675-4 Once the meeting concludes, we'll go to the Tech Pizza restaurant nearby. Oh, BTW, Linux world is coming up in Boston during the first week of April. I've received a couple of emails from the Linux world folks. Does anybody have any interest in representing WLUG at this event? I'd like to go, but it depends on whether or not I can get the time off from work. Are people planning to go, because I think we can get a group discount of some kind. I'll print the emails and bring them to the meeting so we can discuss it. I'll post the info to the list afterwards. See ya later, Andy - -- Andy Stewart, Founder Worcester Linux Users' Group Worcester, MA, USA http://www.wlug.org -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFD8UgRHl0iXDssISsRAgsgAJ9EJLRPyzVvlu+bJAws9R9wlNEUiQCfd/Fc jIhKGn60OhKNLjD2ethRGAE= =KKDx -----END PGP SIGNATURE-----

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Anyone with Verizon fios?
by Bill Mills-Curran 06 Feb '06

06 Feb '06

Anyone using Verizon FiOS? The service looks interesting, but they require their own router. I'm wondering if that prevents all incoming connections, like ssh? Also, the rates they quote on the web page refers to a "bundle discount", but they don't say what a bundle is. Bill

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Rescuing Data From a Hard Drive
by Michael Zarozinski 02 Feb '06

02 Feb '06

Hi All, I've got a bit of a problem... we have a linux server that contained 2 hard drives. The one with the boot information died - LUCKILY the data we NEED was on the hard drive that lived. My question is... how can I recover the data I need? I've been able to boot to the shell using the install disk and can see the data I need but that shell doesn't provide access to the network card so I can copy the data off. I tried a fresh install on a new HD but when I attatch the 2nd HD (with the data I need) I can't see it. Forgive me, I come from the windows world where just plugging in the old HD would allow me to pull the data off. Any ideas/help/etc is greatly appreciated! Michael Z

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RE: [Wlug] Rescuing Data From a Hard Drive
by Hemstreet, Jeffrey L (Jeffrey) 01 Feb '06

01 Feb '06

When you put the 2nd HDD in the system that you built, did you 'mount' the old drive. The system will not automatically mount the old drive when you install it. Putting it into a working system to access the data is the best way. Yes, windows will automatically mount a new drive if it sees a valid formatted partition, but Linux generally does not. jeff -----Original Message----- From: wlug-bounces(a)mail.wlug.org [mailto:wlug-bounces@mail.wlug.org] On Behalf Of Michael Zarozinski Sent: Wednesday, February 01, 2006 2:32 PM To: wlug(a)mail.wlug.org Subject: [Wlug] Rescuing Data From a Hard Drive Hi All, I've got a bit of a problem... we have a linux server that contained 2 hard drives. The one with the boot information died - LUCKILY the data we NEED was on the hard drive that lived. My question is... how can I recover the data I need? I've been able to boot to the shell using the install disk and can see the data I need but that shell doesn't provide access to the network card so I can copy the data off. I tried a fresh install on a new HD but when I attatch the 2nd HD (with the data I need) I can't see it. Forgive me, I come from the windows world where just plugging in the old HD would allow me to pull the data off. Any ideas/help/etc is greatly appreciated! Michael Z _______________________________________________ Wlug mailing list Wlug(a)mail.wlug.org http://mail.wlug.org/mailman/listinfo/wlug

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meeting topic
by Mike Leo 01 Feb '06

01 Feb '06

Am I wrong, or is the gentoo install insanely comlicated? Although I did not sit in front of it from start to finish, it seems like an install takes hours and hours of work... I followed the Handbook (some 80 pages of documentation), which i'm sure is very accurate and each step worked as advertised, but in the end it was too much. After an install of debian, which takes me less than 20 minutes, this was too much for my poor little brain to take, and I eventually gave up. In addition to that, I can't for the life of me, get slackware to consistantly install lilo correctly during the install. Any comments on either of these would be apreciated, however, I am just writing this to toss my vote in for a linux install fest as a meeting topic. I have no problem bringing in a laptop to show the simple, eligant, streamlined, 20 minute debian install, but I would like to also see someone go through a gentoo install, and assist on a slackware lilo config...all of which can be done via my laptop if needed. Thanks ! Mike

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Re: [Wlug] getting that cpu to sleep ...
by Jamie Guinan 30 Jan '06

30 Jan '06

Hi, I just joined the list and was looking through some of the archives. > I have a question for those linux programmers out there. i'm writing > a program on linux (kubuntu to be specific) that requires > high-precision timing, somewhere on the order of 100 to 1000 micro > seconds. <snip> > The problem with this approach is that the process uses 99% of the > CPU since it just spins the CPU until enough time has expired. You can get up to 1/8192Hz (122us) periodic interrupts with the x86 RTC timer. You might have to do a little setup, like, # modprobe rtc # echo 8192 > /proc/sys/dev/rtc/max-user-freq [ fiddle permissions on /dev/misc/rtc or /dev/rtc unless you are running your app as root ] See Documentation/rtc.txt in the kernel source for programming details. Basically the kernel is free to idle or run other things until the RTC interrupt hits, then it wakes up your app doing read() or poll() on /dev/rtc. I used this to pulse a hardware register in a project I did a few years ago, worked good enough for my purposes. You might lose an RTC interrupt here and there if your system is under heavy load (call it "soft realtime"), but I think the interface tells you if and how many you lost. There's also the more advanced HPET timer available for newer x86 systems, but I haven't looked at that yet. Good luck, -Jamie Guinan

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JOB: Seeking Unix SysAdmin
by Andy Stewart 25 Jan '06

25 Jan '06

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Everybody, If you are interested in the following job opportunity, please reply directly to bburns(a)m-Qube.com (Barbara Burns). =====start===== m-Qube, located in Boston, is the premiere mobile messaging management technology company in America and we operate a high-volume wireless messaging ASP. We are currently conducting a search for an experienced Systems Administrator who will be responsible for keeping this Linux/Java/J2EE-based server environment monitored and operational on a 24X7 basis. Responsibilities * Server Administration and Management 1. Configuration, administration and tuning of a high-performance Linux computing environment including new server deployment and setup 2. Develop and maintain scripts for monitoring and automation of periodic jobs 3. Provide problem isolation and resolution using software and diagnostics and/or crash/dump analysis 4. Administration of archive and backup systems 5. Perform ongoing capacity planning activities based on company growth 6. Serve as a system admin knowledge resource for persons throughout the organization 7. Available 24x7 for system emergencies * SAN Storage Administration 1. Maintain existing SAN storage infrastructure 2. Add and reconfigure storage to meet demands of the business 3. Use SAN technology to create backups for disaster recovery * Network Administration 1. Manage network devices including switches, routers and load balancers 2. Resolve issues with network 3. Review logs and run periodic health checks on infrastructure Qualifications: You must have extensive hands-on experience in a high-availability Linux environment with Apache, JBOSS, load balancing and SSL configurations. Your added assets will be an understanding of application programming in Java/JSP, Perl/Javascript or XML interfaces. You have some experience maintaining Cisco network equipment. Candidate must have strong work ethic and possess the ability to perform under time constraints in a dynamic environment. Managing multiple priorities while completing them simultaneously is a basic requirement.The individual must possess excellent skills in troubleshooting complex network environments and devices on his/her own. Experience: Qualified candidates should posses experience in the following: Enterprise-class Linux environments with 5 years of experience Experience with Linux server technologies including NFS, NIS, LDAP, kickstart, etc. Familiarity with engineering tools such as CVS and Bugzilla Proficient in scripting including PERL, Shell, Awk or Sed Extensive operations experience including o Experience analyzing and resolving problems associated with server hardware, server operating system and applications software o Capacity to perform a wide variety of tasks in software/hardware maintenance and operational support of server systems o Strong knowledge and experience with backup policies and emergency recovery procedures Some experience working with the following is preferred: Routing protocol and router administration Maintenance of Java, XML and SQL web applications Education: BS degree in Information Systems or related area desired Please respond directly to Barbara Burns at bburns(a)m-qube.com 617.673.2474 =====end===== - -- Andy Stewart, Founder Worcester Linux Users' Group Worcester, MA, USA http://www.wlug.org -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFD1wKJHl0iXDssISsRApOuAJ4kiKrElcrpiUpcBzlkb03eJxRS/QCfcvE4 i/EIPwzBA5NOL60i3UnW8dQ= =XuEN -----END PGP SIGNATURE-----

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SSH Tunneling?
by Michael Zarozinski 24 Jan '06

24 Jan '06

Hi all, I'm in the process of moving a web site, msql db, and some game daemons to a new server. While the DNS transfer is in process we want all traffic to go to the new server. I've been told this can be done vial ssh tunnels but don't have any experience.... can anyone point me in the right direction? Do I need to set up a tunnel for every port on the old server (the games open ports)? How is it set up to run all the time? Do I need to mess with sshd_config? Any and all help is appreciated! Thanx! Michael Z

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