Run the following command to letbrew
update itself automatically:
brew install pinentry-mac
brew autoupdate start 43200 --upgrade --cleanup --immediate --sudo
Run the following command to letbrew
update itself automatically:
brew install pinentry-mac
brew autoupdate start 43200 --upgrade --cleanup --immediate --sudo
Measuring boot performance in Ubunu is fairly simple. Systemd provides a tool for that.
The overall boot time for kernel and userspace is given by:
systemd-analyze
How much time each boot services takes in descending order is displayed as follows:
systemd-analyze blame
The critical chain for the default target is shown my this:
systemd-analyze critical-chain
Those time can also be graphed as svg:
systemd-analyze plot > boot_analysis.svg
On the source system, do the following:
apt-get install apt-clone
apt-clone clone
Copy \<systemname>.apt-clone.tar.gz to the new machine and run:
apt-get install apt-clone
apt-clone restore .apt-clone.tar.gz
source system:
dpkg --get-selections > ~/Package.list
target system:
apt-get update
apt-get install dselect
dselect update
dpkg --set-selections < ~/Package.list
apt-get dselect-upgrade -y
In order to let an Ubuntu system access the net via a proxy, edit two files and you're done.
/etc/environment
:
http_proxy="http://:/"
https_proxy="http://:/"
ftp_proxy="http://:/"
no_proxy="localhost,127.0.0.1,::1
/etc/apt/apt.conf.d/90_proxy.conf
:
Acquire {
HTTP::proxy "http://:";
HTTPS::proxy "http://:";
}
This is an update to the article from 2009 regarding quieting down snmpd - this time in recent Ubuntu LTS 18.04. The issue at hand is the intense chattyness of snmpd
to syslog
.
Due to the complete shift to systemd, files in /etc/default
are becoming disregarded. Therefore customisations have to be made to /etc/systemd/system
. Two steps are neccessary:
Create a symlink for snmpd
in /etc/systemd
:
ln -s /lib/systemd/system/snmpd.service /etc/systemd/system
Edit that file and change:
ExecStart=/usr/sbin/snmpd -Lsd -Lf /dev/null -u Debian-snmp -g Debian-snmp -I -smux,mteTrigger,mteTriggerConf -f
to
ExecStart=/usr/sbin/snmpd -LS4d -Lf /dev/null -u Debian-snmp -g Debian-snmp -I -smux,mteTrigger,mteTriggerConf -f
Then run
systemctl daemon-reload && service snmpd restart
Now snmpd
should be calmed down.
Lately I ran into some issues using snmp tools, e.g.:
snmpwalk -v2c -c public ${host} test
I received errors like:
Unknown Object Identifier (Sub-id not found: (top) -> test)
This is because MIBs are not installed in Ubuntu by default. To install them use the follwing line:
apt-get install snmp-mibs-downloader
Also comment line 4 of /etc/snmp/snmp.conf
so it shows:
# mibs:
Hope that helps someone.
In El Capitan Apple introduced a feature which opens Mission Cotrol as soon as you drag a window to the top edge of the screen. That is annoying at least to me. Therefore here is a possible fix:
Disable:
defaults write com.apple.dock mcx-expose-disabled -bool TRUE && killall Dock
Enable:
defaults delete com.apple.dock mcx-expose-disabled && killall Dock
After running virtual machines in KVM for some time, it might come in handy to be able to resize a KVM guest's raw volumes. In order to do so you first have to shutdown your VM for a while:
virsh destroy <guestname>
In order to add an additional 2 gig to your respective machine, you do the following:</guestname>
qemu-img resize <diskname>.img +2G
Now restart the machine:</diskname>
virsh start <guestname>
Then use fdisk
inside the guest to make use of the new space:
fdisk /dev/vda
There, you delete the respective partition and immediately recreate it - with more space. Now restart the machine in order to let the kernel make note of the changes:
reboot
After a final resize you're able to make use of the sweet new space:
resize2fs /dev/vda1
Voila!
In order to cleanup docker containers from time to time just fire the following:
docker system prune -a
In package center > settings:
Install in this order:
Packages will be installed to /opt
.
Command-line tool is opkg.
opkg list-installed
opkg list *gcc*
Source /opt/etc/profile
at the end of the ~/.profile
file for each user that needs
to use packages installed by ipkg.