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• How to set up Heartbeat to run a service only at one node

  - by Jon Skarpeteig

  I have two Ubuntu 12.04 servers, which run mysql in a master-master setup, with mmm as manager. How can I set up heartbeat to make sure that mmm only runs at one node at the time? *Edit to explain more clearly My setup: ---------VIP (10.0.0.123)------ | | Node1 Node2 Where bot Node1 and Node2 run: Mysql Multi-Master Replication Manager for MySQL (mmm) Heartbeat I only want a single write enabled mysql node, and I can only have one mmm running at the time, else I'll get collision between the managers.

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• How can I port forward with an airport extreme and a NAT enabled modem?

  - by Jon

  I run an Actiontec HD701D modem with NAT to an Airport extreme base station to laptop etc. As you might expect I get double NAT issues. I tried a lot of different things to forward a port, but no luck. Currently the airport is in bridge mode letting the modem handle the NAT, but still can't forward the port. Also to note: firewall is off on the router, firewall is set to allow the application in OSX 10.6.3 and I did forward the port in the router. No luck.

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• One-Way Backup Service? [closed]

  - by Jon Rodriguez

  Up until a month ago, my girlfriend has used MobileMe to backup all the files on her MacBook. This turned out terribly when a quirk of MobileMe caused it to erase all of her files on MobileMe, and then sync the newly-erased MobileMe down to her computer, erasing everything. A week's worth of college essays and CS homework were gone. Now, I am terrified of any commercial cloud-backup solutions because of the possibility of this happening. Going off the list provided in these answers, could you please help me find a good backup service that is completely one-way? I want a service where there is literally not a single line of code that has the possibility of writing to my computer's drive. I want a pure one-way backup service.

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• hosts file for ip address

  - by Jon Clegg

  I would like to map ip address to specific localhost interfaces (e.g. 23.45.66.77 = 127.0.3.3). For named hosts I can use the hosts file. Naturally this doesn't work for IP address. This has to work in windows, the only option I've found so far is implementing a TAP/TUN driver like openvpn does. Are there any other options?

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• Why does my exchange message filtering rule not work?

  - by Jon Cage

  I have two rules set up to sort incoming bug reports. The first is specific to a single device: Apply this rule after the message arrives sent to SMS Distribution and with <source_device_number>: in the body move it to the BugReports\<source_device_number> folder ..and the second is a catch-all for everything else: Apply this rule after the message arrives sent to SMS Distribution move it to the BugReports folder For some reason though, the first rule never seems to act even though it's higher in the list. So for some reason an email like the following doesn't seem to get caught by the first rule: From: <SourceDeviceUID> To: SMS Distributor Subject: Message from <SourceDeviceUID> Message: <source_device_number>: Device encountered a problem. Details below... ...where <source_device_number> is an integer. The second rule works fine. But for some high-priority devices, I want them automatically sorted. Why might that first rule fail?

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• Seasgate GoFlex NAS + Horrible Speed = Bad Experience

  - by Jon H

  I am having issues with transfer speeds from my desktop PC to my NAS. I have my NAS hooked up to a Gigabit Gateway as well as my Desktop with Cat 5e. I see up to 4.0 MB/Second Transfer Rates, the normal is about 2.5 MB/Seconds. There is 3 Partitions on my NAS, Public, Private, Backup. When I transfer from Private to Public I see the speeds above. If its under the same partition almost instant. I was wondering if the speeds I am seeing is in due to my Computer or the NAS. I was looking into building my own Media Server in due to these horrible speeds. Is their anything I can do in the mean time to speed this up? Motherboard = M3970AM-HP (Angelica) Processor = AMD FX 6100 Ram = 10GB PC3-10600 MB/sec Hard Drive (1) = 1.5TB SATA 3.0GB 5400RPM Hard Drive (2) = 120GB SATA SSD NAS = Seagate 3TB Go Flex Home Connection (1) = 1000 Base T Connection (2) = Wireless N

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• How Can I get a bit-perfect copy of a CF card?

  - by Jon Cage

  Is there any way I can get a bit level copy of a Fat32 compact flash card? Like make an ISO of it or something?

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• Postfix - How to configure to send these emails?

  - by Jon

  I want my mailserver to send mail from my local application "from" any user supplied email address "to" my own address, say "[email protected]". The MX records for "mysite.com" actually point to a different server, even though the outgoing mainserver is running with mydomain set as "mysite.com". Perhaps this is part of the problem? postfix is currently causing a SMTPRecipientsRefused error within the python application. Can anyone point me to what to change in the configuration? Thanks postconf -n: alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no config_directory = /etc/postfix inet_interfaces = all mailbox_command = procmail -a "$EXTENSION" mailbox_size_limit = 0 mydestination = mysite.com, localhost.com, , localhost, * myhostname = mysite.com mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 myorigin = /etc/mailname readme_directory = no recipient_delimiter = + relayhost = smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU) smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_use_tls = yes

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• Why do server administrators not open up IMAP on an Exchange server?

  - by Jon

  In a corporate environment running Exchange and Outlook clients connecting to it why do server administrators not allow IMAP to be turned on for those that would like to connect to the server using IMAP? I'm assuming the simple answer is port attacks and please excuse my naivety but does Exchange not suffer the same problems or is it because its behind the firewall and within the corporate network?

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• How to tell which physical disks have bootable MBR?

  - by Jon

  The computer I am using right now has 6 physical disks attached. Using the BIOS's "select boot device" functionality I have discovered that I can boot off 3 of these disks into the exact same bootloader. This means that all of these disks have the bootable flag set on their MBR, even though I had been under the impression that only 2 of them are in fact bootable. My question is: is there an easy way to check which disks have a bootable MBR with a command line tool or some OS utility? I am aware of the DISKPART tool and its basic functionality, but I haven't found how to view the information I need. The OS is Windows 7 x64 Ultimate with SP1.

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• Updated my WAMP Server and MySQL is eating up 580mB of memory

  - by Jon

  I updated my dev-box's WAMPSERVER, and along with updating PHP and Apache, MySQL updated to '5.6.12'. After doing that, I copied the data folder from my old (5.1.36) install to the new one and now MySQL takes up 580mB which is way too much, since I'm the only person using it (Locally) and there are only 20 or so databases on it, none of which have 'memory' tables. How can I get this down to a decent amount? My my.ini: # For advice on how to change settings please see # http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html # *** DO NOT EDIT THIS FILE. It's a template which will be copied to the # *** default location during install, and will be replaced if you # *** upgrade to a newer version of MySQL. [mysqld] # Remove leading # and set to the amount of RAM for the most important data # cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%. # innodb_buffer_pool_size = 128M # Remove leading # to turn on a very important data integrity option: logging # changes to the binary log between backups. # log_bin # These are commonly set, remove the # and set as required. # basedir = ..... # datadir = ..... # port = ..... # server_id = ..... # Remove leading # to set options mainly useful for reporting servers. # The server defaults are faster for transactions and fast SELECTs. # Adjust sizes as needed, experiment to find the optimal values. # join_buffer_size = 128M # sort_buffer_size = 2M # read_rnd_buffer_size = 2M sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES Database info: Storage Engine Data Size Index Size Total Size InnoDB 48.00 KB 0.00 B 48.00 KB MEMORY 0.00 B 0.00 B 0.00 B MyISAM 163.64 MB 122.49 MB 286.13 MB Total 163.69 MB 122.49 MB 286.18 MB

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• Connecting a USB laptop to a RJ45 serial port

  - by Jon

  We are about to get our first managed switch at work (Procurve 2520G-24-PoE), and this lowly programmer gets to put on his admin hat and try to configure it. The switch has an RJ45 serial port for console access. My laptop has USB ports but no serial port. In fact, there isn't a single computer in the office with a serial port. I've seen USB-to-DB9 adapters, but I need to go from USB to RJ45 (serial). How would I go about accomplishing this? Do I need two adapters? Will USB-to-DB9 and then DB9-to-RJ45 work? Thanks in advance.

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• On Mac OS X how can I monitor what is using my internet connection?

  - by Jon Hopkins

  I've got a relatively limited broadband connection (I live miles from the nearest exchange) and from time to time net access (but nothing else) slows to a near crawl. I know from a bit of monitoring software that the connection is being fairly heavily used which would explain it but I don't know what's using it. There are certainly plenty of things which might (these days there are dozens of apps that will either regularly or infrequently check data or download updates) but how can I find out? I'm happy to pay (a small amount of) money if needed, though in that case I'd rather it were a recommendation that me just Googling for something.

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• Monitoring tools that can take high rate and high volume?

  - by Jon Watte

  We're using Cacti with RRDTool to monitor and graph about 100,000 counters spread across about 1,000 Linux-based nodes. However, our current setup generally only gives us 5-minute graphs (with some data being minute-based); we often make changes where seeing feedback in "near real time" would be of value. I'd like approximately a week of 5- or 10-second data, a year of 1-minute data, and 5 years of 10-minute data. I have SSD disks and a dual-hexa-core server to spare. I tried setting up a Graphite/carbon/whisper server, and had about 15 nodes pipe to it, but it only has "average" for the retention function when promoting to older buckets. This is almost useless -- I'd like min, max, average, standard deviation, and perhaps "total sum" and "number of samples" or perhaps "95th percentile" available. The developer claims there's a new back-end "in beta" that allows you to write your own function, but this appears to still only do 1:1 retention (when saving older data, you really want the statistics calculated into many streams from a single input. Also, "in beta" seems a little risky for this installation. If I'm wrong about this assumption, I'd be happy to be shown my error! I've heard Zabbix recommended, but it puts data into MySQL or some other SQL database. 100,000 counters on a 5 second interval means 20,000 tps, and while I have an SSD, I don't have an 8-way RAID-6 with battery backup cache, which I think I'd need for that to work out :-) Again, if that's actually something that's not a problem, I'd be happy to be shown the error of my ways. Also, can Zabbix do the single data stream - promote with statistics thing? Finally, Munin claims to have a new 2.0 coming out "in beta" right now, and it boasts custom retention plans. However, again, it's that "in beta" part -- has anyone used that for real, and at scale? How did it perform, if so? I'm almost thinking about using a graphing front-end (such as Graphite) and rolling my own retention backend with a simple layer on top of mmap() and some stats. That wouldn't be particularly hard, and would probably perform very well, letting the kernel figure out the balance between frequency of flushing to disk and process operations. Any other suggestions I should look into? Note: it has to have shown itself able to sustain the kinds of data loads I'm suggesting above; if you can point at the specific implementation you're referencing, so much the better!

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• Easiest way to move my Windows installation to an SSD?

  - by Jon Artus

  I've taken the plunge and bought an SSD and want to move my existing Windows installation over. The current hard disk is 500Gb, but I've trimmed the contents down to about ~40Gb. I'm transferring it across to a 100Gb SSD and looking for the easiest way just to copy everything across and set the SSD up as a boot device. I've looked at a few tools like Macrium Reflect, but they don't seem able to restore to a smaller drive. Do I need to go for something like PING to do this? I'm trying to avoid scary Linux-based boot utilities if possible, does anyone know of an easier way?

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• On developing deep programming knowledge

  - by Robert Harvey

  Occasionally I see questions about edge cases and other weirdness on Stack Overflow that are easily answered by the likes of Jon Skeet and Eric Lippert, demonstrating a deep knowledge of the language and its many intricacies, like this one: You might think that in order to use a foreach loop, the collection you are iterating over must implement IEnumerable or IEnumerable<T>. But as it turns out, that is not actually a requirement. What is required is that the type of the collection must have a public method called GetEnumerator, and that must return some type that has a public property getter called Current and a public method MoveNext that returns a bool. If the compiler can determine that all of those requirements are met then the code is generated to use those methods. Only if those requirements are not met do we check to see if the object implements IEnumerable or IEnumerable<T>. That's cool stuff to know. I can understand why Eric knows this; he's on the compiler team, so he has to know. But what about those who demonstrate such deep knowledge who are not insiders? How do mere mortals (who are not on the C# compiler team) find out about stuff like this? Specifically, are there methods these folks use to systematically root out such knowledge, explore it and internalize it (make it their own)?

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• Port forwarding with multiple IP's

  - by Jon

  I work at a company which uses a Fortigate 60 router, something I'm not really familiar with. Everything worked fine with it until a week ago when Comcast came in and replaced our modem. It seemed as though the process went smoothly - our connection came back up and our static IP remained the same. However, none of our port forwarding is working. What has me confused is the Comcast modem apparently has two IP addresses. The WAN2 interface for it in the Fortigate router is set to 10.1.10.10. However, all of our port forwarding settings are set to an external IP address of 10.1.10.50. Now this setup used to work fine, so something with the Comcast modem must have changed. How can I find out what? I tried setting a computer to a local IP of 10.1.10.15 so I could open up the web interface for the modem, but I can't even ping 10.1.10.10 when I do that. Any ideas? Thanks!

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• How do private BitTorrent trackers monitor how much users upload/download?

  - by Jon-Eric

  From Wikipedia: Most private trackers monitor how much users upload or download, and in most situations, enforce a minimum upload-to-download ratio. How exactly can a tracker figure out how much data was uploaded and downloaded by each user? My understanding is that a BitTorrent tracker is merely a registry of users that are currently downloading/seeding and that peers, once connected, transfer data directly. So I wouldn't think that the tracker would know anything about the amount of data transferred, much less, where it came from.

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• Technology mash: is this possible?

  - by Jon Story

  I'm in the process of setting up my own DNS+hosting on a couple of VPS and my home machines, mostly for academic/learning purposes, but also for convenient accessing of my files, hosting my personal websites, private git repositories etc. I've got a main web server with DNS, and a slave DNS server. I've also got a couple of machines at home doing file hosting, video streaming and all that fun stuff. I'm intending to use my VPS's to provide myself with a dynamic DNS system so that I can point mydomain.com at my DNS servers, with home.mydomain.com going into my home network via a raspberry pi. HOWEVER.... I've not got access to the network infrastructure at home (rented accommodation with managed internet), so I can't forward the ports on the router to my own machines. As such, I'm wondering if it's possible to route all the traffic via an SSH/HTTP tunnel through one of the VPS? My plan is to have the raspberry pi provide a VPN into my home network. The raspberry pi uses SSH to connect to the VPS, and the VPS forwards any traffic to home.mydomain.com via the tunnel to the raspberry pi. Is this even possible, and how do I go about it? I don't mind getting my hands dirty with coding and low level tools, I'm just not sure where to start or what the best way to go about it is.

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• How can I make a VB script execute every time Windows starts up?

  - by jon

  My goal is to copy INI.file each time Windows XP is started up or rebooted. The following VB script copies INI.file from a local directory to C:\INI_DIR. I tried to copy the VB script to C:\WINDOWS\system32\config\systemprofile\Start Menu\Programs\Startup, but it doesn't get activated. Is it not the right path? How can I make it execute on startup/reboot? The script: Dim currDir Const OverwriteExisting = True Set fso = CreateObject("Scripting.FileSystemObject") currDir = fso.GetParentFolderName(Wscript.ScriptFullName) Set objFSO = CreateObject("Scripting.FileSystemObject") objFSO.CopyFile currDir & "\INI.file" , "C:\INI_DIR" , OverwriteExisting ' Release the objFSO objects Set objFSO = Nothing ' Release the fso objects Set fso = Nothing

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• Is there still a place for tape storage?

  - by Jon Ericson

  We've backed up our data on LTO tapes for years and it's a real comfort to know we have everything on tape. A sister project and one of our data providers have both moved to 100% disk storage because the cost of disk has dropped so much. When we propose systems to potential customers these days we tend to downplay or not mention our use of tape systems for data storage since it might seem outdated. I feel more comfortable with having data saved in two separate formats: disks and tape. In addition, once data is securely written to tape, I feel (perhaps naively) that it's been permanently saved. Not having to rely on a RAID controller to be able to read back data is another plus for me. Do you see a place for tape backup these days?

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• Ubuntu "No space left on device" for /home, df shows 100% full, ds shows much, much less

  - by Jon Cram

  On an Ubuntu 12.04 server, normal users can no longer create or add to files in /home, encountering a "No space left on device" error. The /home directory has a capacity of 1.7 terabytes and as far as I can tell is nowhere near full in terms of actual data stored or inodes used. df -h shows: Filesystem Size Used Avail Use% Mounted on /dev/md2 1.0T 18G 955G 2% / udev 7.7G 4.0K 7.7G 1% /dev tmpfs 3.1G 320K 3.1G 1% /run none 5.0M 0 5.0M 0% /run/lock none 7.7G 0 7.7G 0% /run/shm cgroup 7.7G 0 7.7G 0% /sys/fs/cgroup /dev/md3 1.7T 1.7T 0 100% /home /dev/md1 496M 45M 426M 10% /boot /home indeed looks rather full. du -hs /home suggests otherwise: 1.4G /home There appears no inode issue - df -i: Filesystem Inodes IUsed IFree IUse% Mounted on /dev/md2 67108864 75334 67033530 1% / udev 2013497 527 2012970 1% /dev tmpfs 2015816 440 2015376 1% /run none 2015816 2 2015814 1% /run/lock none 2015816 1 2015815 1% /run/shm cgroup 2015816 9 2015807 1% /sys/fs/cgroup /dev/md3 113909760 105981 113803779 1% /home /dev/md1 131072 239 130833 1% /boot I recently deleted a many gigabytes of application cache and log data from /home, however this was in the tens of gigabytes at best and nowhere near the capcity of /home. Update 1: du -hs --apparent-size /home 1.2G /home du -hs /home 1.4G /home What might be going on here?

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• How does one delete a directory filled with files and other subdirectory permanently, bypassing the trash, from the command line in OS X?

  - by Jon

  So my command line skills are a little rusty and I'm having trouble remembering the differences between the meanings of flags in different distro's os's. I also don't really remember all my technical lingo so manpages seem really unclear. Basically I'm on Mac OS X and want to delete a directory along with all of its contents. What I'm mainly concerned about, I suppose, is that it'll delete literally ALL of the references within the directory, including ../ and ../<everything else, including ../'s own ../> and then just totally screw up my entire system. Which of these do I want to run? $ rm -R dir-name/ or $ rm -r

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• How to override puppet class arguments in child node?

  - by Jon Skarpeteig

  I'm attempting to accomplish something like the below: node 'basenode' { class { 'puppet' : disable => false, } } node 'child' inherits 'basenode' { class { 'puppet' : disable => true, } } This gives me: err: Could not retrieve catalog from remote server: Error 400 on SERVER: Duplicate definition: Class[Puppet] is already defined How can I override this setting for this single node, and still have a parameterised class?

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• OS X Terminal ends session at opening : permission denied

  - by Jon

  I have an issue with Terminal on MacOS X 10.7.4. I know where it comes from, but I don't know how to solve it : Yesterday, I installed fish-shell as a shell replacement. Following the installation instructions, I ended typing the following command : chsh -s /usr/local/bin/fish I noticed I had to do a : sudo bash for it to work. Once done, I quit. Today, I try to run Terminal and I see te following message : Last login: Wed Jun 27 12:38:01 on ttys000 login: /usr/local/bin/fish: Permission denied [Opération terminée] (yes, I'm French, which explains my poor English). I cannot type any command since I have no access to the Terminal. I tried with iTerm2 but same issue. No command is set at launch in the default profile of Terminal/iTerm2 (well, in the UI). How can I take the power back ? Thank you.

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