If you need to start an x window after sudo ing as someone after doing ssh, you may run into permission problems, for example: ssh -Y A@remote_machine su B xclock it will fail. To grant such permission, as user A, type: xauth list then, copy the whole line. Su to B, and type: […]
When in grub rescue, you only got insmod, ls, set, unset (I think). Thus, you must insmod the required modules in order to be able to do anything substantial. do: set root=<whatever> set prefix=<whatever>/boot/grub where <whatever> is like (md0) or (hd2,1). the /boot/grub is by default where modules are, so that insmod will work. If […]
subversion uses ssh. If ssh blocked from A to C, but A-> B and B->C is not blocked, setup tunneing: 1. on A: /etc/subversion/config in the [tunnel] section, add: ssh = $SVN_SSH ssh -o ControlMaster=no <machine B’s hostname> ssh -o ControlMaster=no 2. on B: /etc/ssh/ssh_config HostbasedAuthentication yes EnableSSHKeysign yes 3. on C […]
Introduction As an owner of a software and IT company, I love to solve technical problems. That’s why when recently sites I own and run, as well as my customers’ sites, were seemingly infected with malware (through no fault of mine or the company’s, more on this later), and having swiftly removed the said malware, […]
you su, then screen, and get: “Cannot open your terminal ‘/dev/pts/3’ – please check.” You instead need to run: screen < /dev/tty
Quick way to listen and serve data on a port: cat test.txt | nc -l 8649
Installation Install hadoop: https://ccp.cloudera.com/display/CDHDOC/CDH3+Installation (optional) Links to installing hive/pig/hbase are on the bottom of the link in step 2. Configuration Hive: by default it does not allow multiple users, because by default it uses a local derby metastore. So, if you wish to have multiple users connect to it, install mysql, and configure /etc/hive/conf/hive-site.xml. See […]
When SOL and linux won’t boot (i.e. like /etc/fstab is misconfigured, which prevents you from booting and correctly configuring /etc/fstab…chicken and the egg type of situation…), you could in theory boot with a live cd or something along those lines. Otherwise, you can, from grub (i.e. grub menu -> find the entry you’re booting with, […]
Shrinking Root with Software Array, then Replacing Root with another Root Image 0. Start console. This is a hardware thing, whereby you can monitor the system console even during a reboot. For example: ssh console@slcradar03-sp.con.slc.ebay.com start /SP/console escape + ( gets out of the console. then, you can do a “reset/SYS” to reboot Take […]
By default, the system clock in Debian is set to UTC (Universal Time), and then adjusted to your local time, based on your time zone and daylight savings time. This can be a problem if you are running a Debian VirtualBox guest machine, because VirtualBox sets the virtual machine’s system clock to local time when […]