yum install gcc-c++ make openssl-devel
wget http://nodejs.org/dist/v0.8.15/node-v0.8.15.tar.gz tar zxvf node-v0.8.15.tar.gz cd node-v0.8.15 ./configure make make install
yum install git git clone git://github.com/joyent/node.git cd node ./configure make make install
nJoy 😉
This is quite a common issue with X11 upgraded on a Centos Minimal.
quick fix ( not perfect but gets the system through the hump :
dbus-uuidgen > /var/lib/dbus/machine-id
This should fix the issue.
nJoy 🙂
Assume you do not have curl/telnet/netcat (or nc does not support -z as in later versions ?? why did they remove it ?? ) the following will work on any recent Bash version.
(echo > /dev/tcp/skinner/22) >/dev/null 2>&1 && echo "Port is open" || echo "Port is closed"
nJoy 😉
So you have a script on the local machine and you want to run it remotely and pass arguments to it :
ssh user@remote 'cat | bash /dev/stdin param1 param2 .. paramN' < /usr/scripts/localscript.sh
😉 nJoy
tcpdump -s 0 -l -w - dst port 3306 | strings
nJoy 😉
esxcli network ip neighbor list
njoy 😉
a=0;
for i in `cat $FOLDERLIST`
do
((a++))
percentage=`awk -v a=$a -v b=$NUMBEROFFOLDERS 'BEGIN {printf "%3.0f", a / b * 100; exit } '`
arrow=`printf '=%.0s' $(seq 1 $percentage)`
headed=`printf '%s%s' $arrow '>'`
paddedarrow=`printf '%-102s' $headed`
echo -ne "$paddedarrow $a/$NUMBEROFFOLDERS [$percentage] \r "
done
echo
njoy 😉
Setting up a listener in UDP :
Install socat
Jist here (Centos 6.6 : http://jist.sudoall.com/socat/setup
install
curl “http://jist.sudoall.com/socat/setup” | bash –
socat -u udp-recv:8888 –
To send the datagram :
nc -u 127.0.0.1 8888
njoy 😉
The “magic SysRq key” provides a way to send commands directly to the kernel through the /proc filesystem. It is enabled via a kernel compile time option, CONFIG_MAGIC_SYSRQ, which seems to be standard on most distributions. First you must activate the magic SysRq option:
echo 1 > /proc/sys/kernel/sysrq
When you are ready to reboot the machine simply run the following:
echo b > /proc/sysrq-trigger
This does not attempt to unmount or sync filesystems, so it should only be used when absolutely necessary, but if your drive is already failing then that may not be a concern.
In addition to rebooting the system the sysrq trick can be used to dump memory information to the console, sync all filesystems, remount all filesystems in read-only mode, send SIGTERM or SIGKILL to all processes except init, or power off the machine entirely, among other things.
nJoy 😉
curl -o – “http://localhost:9200/_nodes/process?pretty”
{
“cluster_name” : “prod-escluster”,
“nodes” : {
“NUyPv6zIQDS3wo_u_8FUaw” : {
“name” : “es01”,
“transport_address” : “inet[/192.168.1.147:9300]”,
“host” : “es-01.streamuk.com”,
“ip” : “127.0.0.1”,
“version” : “1.4.2”,
“build” : “927caff”,
“http_address” : “inet[/192.168.1.147:9200]”,
“attributes” : {
“master” : “true”
},
“process” : {
“refresh_interval_in_millis” : 1000,
“id” : 2185,
“max_file_descriptors” : 500000,
“mlockall” : false
}
}
}
}