Motion
Motion is a program that runs as a service, monitors the input from cameras, and detects whether or not there is motion. It can then record that input to video or to consecutive screenshots.
See also
Skip one record on MySQL replication slave
MySQL replication can break for a wide multitude of reasons. The
following is a quick and dirty way to resume replication, if the error
that appears in the output of SHOW SLAVE STATUS\G indicates that
replication stopped at a specific record.
It is a dirty way, because immediately after using it the database on the slave becomes different from that on the master by one record. If you can live with that, the skip-one method can help you quickly put the slave back in track.
On the MySQL CLI:
mysql> STOP SLAVE;
mysql> SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1;
mysql> START SLAVE;
mysql> SHOW SLAVE STATUS\G
Hopefully your replication will resume after this, and the value of
your Seconds_Behind_Master will quickly be depleted.
Colored output with Python
Here's my stupid way of getting colored output from a Python script when run from the command line.
First, define one function per desired color:
{% highlight python %} def blue(message): return '\033[1;34m%s\033[1;m' % (message) def green(message): return '\033[1;32m%s\033[1;m' % (message) def red(message): return '\033[1;41m%s\033[1;m' % (message) def yellow(message): return '\033[1;33m%s\033[1;m' % (message) {% endhighlight %}
And then in the script, pass the message that you need to appear in color like this:
{% highlight python %} print red('File not found!') {% endhighlight %}
Note that if the Python script is meant to run via cron, then you will get some ugly text in emails from cron, since escape codes are not interpreted or removed from the output.
/etc/sysconfig/network-scripts/ifcfg-eth0
Example of a network interface configuration file:
# Hardware configuration:
UUID="46e26279-f69b-daf5-1b79-d03677b7178d"
HWADDR=00:1C:C0:0D:36:C6
DEVICE="p1p1"
TYPE="Ethernet"
ONBOOT="yes"
NAME=eth0
NM_CONTROLLED="no"
# IPv4 configuration:
BOOTPROTO="none"
IPADDR0="192.168.1.100"
PREFIX0="24"
GATEWAY0="192.168.1.1"
DNS1="192.168.1.53"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="yes"
# IPv6 configuration:
IPV6INIT="yes"
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
Parameters
BOOTPROTO- Can be set to
dhcpif the interface will be automatically configured by a DHCP server, or tostaticif the interface will have a static IP configuration, or tonone. DEFROUTE- If set to
yes, then during the activation of the interface, a default route towards the associated gateway will be added on the system. HWADDR- The MAC Address of the interface, (
HWaddrin the output ofifconfig), physically burnt on the device by the manufacturer. NM_CONTROLLED- Whether or not the interface is controlled by the NetworkManager
service. If set to
no, the operation of the interface needs to be controlled elsewise, e.g. with running thenetworkservice in the place of NetworkManager. ONBOOT- Whether or not the interface should be activated automatically during system startup.
Install Motion on CentOS 6
These are some very very brief instructions on how to install Motion on a CentOS 6 system.
Install Prerequisites
yum -y install gcc make
yum -y install libjpeg-turbo libjpeg-turbo-devel
Install Motion
Download Motion, e.g. as a .tgz from SourceForge:
cd /root/
wget http://downloads.sourceforge.net/project/motion/motion%20-%203.2/3.2.12/motion-3.2.12.tar.gz?r=http%3A%2F%2Fsourceforge.net%2Fprojects%2Fmotion%2Ffiles%2Fmotion%2520-%25203.2%2F3.2.12%2F&ts=1385393313&use_mirror=garr
Untar:
tar zxvf motion-3.2.12.tar.gz
Install:
cd /root/motion-3.2.12/
./configure
make
make install
This will install motion in its default location, in subdirectories of
/usr/local/, e.g:
/usr/local/bin/for executables,/usr/local/man/for man pages,/usr/local/etc/for configuration files,/usr/local/docs/for documentation,/usr/local/share/for configuration examples, etc.
Finally, before starting motion you need to copy the default
configuration file motion-dist.conf to motion.conf (by default in
/usr/local/etc/.
Preparing a new CentOS 6 Server
These are some reminders to myself, to apply my personal preferences when installing a new server based on CentOS 6.
Make booting verbose, remove the portion
rgbh quietfrom thekernelline in/boot/grub/grub.conf.Install misc tools:
yum -y install vim yum -y install wget yum -y install mlocate yum -y install iptraf yum -y install iotraf yum -y install man yum -y install nmapCRON Configuration: Sometimes fresh Minimal CentOS installations don't come with Cron pre-installed. In such a case:
yum -y install cronie cronie-anacron crontabsThen activate and enable the service:
chkconfig crond on service crond startSNMP Configuration:
yum -y install net-snmp chkconfig snmpd onIn
/etc/snmp/snmpd.confchange the community to something other than the defaultpublic, for example change the line:com2sec notConfigUser default publicTo something like:
com2sec notConfigUser default My_pr1vate_c0mmunityAlso, if you are using an NMS like Zenoss that can poll all sorts of information from the device via SNMP, you can greatly expand the range of data available with commenting out the following two lines...
view systemview included .1.3.6.1.2.1.1 view systemview included .1.3.6.1.2.1.25.1.1...and substituting them with:
view systemview included .1Disable console blanking by editing
/boot/grub/grub.confand adding the following at the end of thekernelline:consoleblank=0
Sources
- For the console blanking tip: You want to turn console blanking off on your Linux servers.
Flowchart and Diagram Editors
Online Flowchart and Diagram Editors
- Google Docs has a Drawing application that can be used to create diagrams.
- Gliffy can also create several types of diagrams, and is free for a limited amount of documents.
- LucidChart is another online diagram editor, and is also free with some restrictions.
See Also
- How to draw flowchart or diagram on Linux, a round-up and overview of flowchart and diagram applications for Linux.