wesley tanaka

Tech

How to catch up vmware clock to accurate time after a virtual machine pause/un-pause

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When you pause a VMWare Fusion virtual machine on a Mac OSX host and resume it after a long time, your system clock will sometimes be behind. ntpd won't catch the clock up if it's too far behind. One manual solution is to run ntpdate in the guest operating system once the virtual machine unpauses:

sudo ntpdate pool.ntp.org

Another approach which I am currently trying, is to set your clocksource to use acpi_pm instead of tsc. You can check which clocksources you have available with:

Installing Ubuntu onto a NFS mount

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It is possible to install Ubuntu onto a NFS networked filesystem directory, which you might want to do in order to boot that copy of Ubuntu over the network on a diskless thin client computer.

Set up the base filesystem:

Booting Ubuntu from a network filesystem

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It is possible to boot Ubuntu over the network on a computer with no local hard drive. You need:

  • A DHCP server that supports PXE
  • A TFTP server with enough space to host the kernel binary
  • An NFS server with enough space to host the root filesystem

The steps involved are:

Building debian .deb packages from source

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These are my notes on building debian packages from source.

The steps in preparing a binary debian packages are roughly:

  1. Start with the upstream source code (e.g. .tar.gz)
  2. Unpack it
  3. Add a debian/ subdirectory inside of the unpacked source code
  4. Create a debian prepared source code (.orig.tar.gz) containing the debian/ directory
  5. Create source package (.dsc)
  6. Create binary package (.deb)

Steps without using ubuntu bzr:

LXC command cheat sheet / quick reference

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lxc-create -t download -n mycontainer -- -d ubuntu -r trusty -a amd64
Create an (unstarted) container. Other architectures include: i386
lxc-start -n mycontainer -d
Boot up a container -- excluding -d will also run lxc-console
lxc-attach -n mycontainer
Execute a root shell inside of a started container
lxc-console -n mycontainer
Open a login screen inside of a started container
lxc-stop -n mycontainer
Shut down a started container

Progress Bar Project Management

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To an outsider looking in, commercial software projects* should look like a well designed progress bar.

Dockerfile library

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I've created some scripts and Dockerfiles to build docker images. There are images for:

Ways to download a file via HTTP from the command line

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Current Ubuntu distributions do not come with either wget or curl installed, but they do include Python and Perl. Here are some alternative ways to download a file and print it on stdout without wget or curl:

Shaing your home directory between Mac OSX and a VMware Fusion 7 Linux Virtual machine

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First, give your virtual machine a fixed IP address.  VMWare Fusion's dhcpd server will often change the IP address assigned to your virtual machine -- even while it's still running.  While you can give the entire IP address range block access to your home directory over NFS, that can disrupt some other tools like Vagrant.

% cat /etc/exports
/Users/wtanaka 172.16.221.10 -maproot=root:wheel

Restart nfsd in Mac OS:

% sudo nfsd stop
% sudo nfsd start

Assigning a fixed IP address to a virtual machine in VMware Fusion 7

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1. Find the dhcpd.conf corresponding to the network that your virtual machine is on.  By default the NAT network uses /Library/Preferences/VMware Fusion/vmnet8/dhcpd.conf. You can find the right one by running ifconfig (or ipconfig in Windows) inside your virtual machine to find its IP address, and look for a range containing that IP address in all of the dhcpd.conf files.

2. Edit the file to add the portions in green.  Be careful not to use a number in the dynamically allocated range, the host computer's IP, or the DNS IP:

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by Wesley Tanaka