Feeds:
Posts
Comments

Posts Tagged ‘Source’

What is Keepalived ?

Keepalived is a routing software written in C. The main goal of this project is to provide simple and robust facilities for loadbalancing and high-availability to Linux system and Linux based infrastructures. Loadbalancing framework relies on well-known and widely used Linux Virtual Server (IPVS) kernel module providing Layer4 loadbalancing. Keepalived implements a set of checkers to dynamically and adaptively maintain and manage loadbalanced server pool according their health. On the other hand high-availability is achieved by VRRP protocol. VRRP is a fundamental brick for router failover.

Visit here for more details : http://www.keepalived.org/

Pre-requirements

  1. Additional Packages required to build/compile keepalived from sourcesudo apt-get install build-essential libssl-dev keepalived psmisc
  2. Move Installed keepalivedmv /usr/sbin/keepalived /usr/sbin/keepalived.orig
  3. Change keepalived service script:

    vi /etc/init.d/keepalived

    Modify the path: “DAEMON=/usr/sbin/keepalived” to “DAEMON=/usr/local/sbin/keepalived”

  4. Need Additional 1 Virtual IP(VIP) address on top of existing IP

Download Source Code

sudo apt-get install wget

wget wget http://www.keepalived.org/software/keepalived-1.2.13.tar.gz

tar -zxvf keepalived-1.2.13.tar.gz

Build and Install from Source Code

cd keepalived-1.2.13
./configure
make
make install
keepalived -v
Keepalived v1.2.13 (11/30,2016)

Start Keepalived

/etc/init.d/keepalived start

Or

service keepalived start/restart/stop

Error :

Nov 30 15:25:39 node-2 Keepalived[14392]: Starting Keepalived v1.2.13 (11/30,2016)
Nov 30 15:25:39 node-2 Keepalived[14393]: Starting Healthcheck child process, pid=14395
Nov 30 15:25:39 node-2 Keepalived[14393]: Starting VRRP child process, pid=14396
Nov 30 15:25:39 node-2 Keepalived_healthcheckers[14395]: Initializing ipvs 2.6
Nov 30 15:25:39 node-2 Keepalived_vrrp[14396]: Registering Kernel netlink reflector
Nov 30 15:25:39 node-2 Keepalived_vrrp[14396]: Registering Kernel netlink command channel
Nov 30 15:25:39 node-2 Keepalived_vrrp[14396]: Registering gratuitous ARP shared channel
Nov 30 15:25:39 node-2 Keepalived_vrrp[14396]: Opening file ‘/etc/keepalived/keepalived.conf’.
Nov 30 15:25:39 node-2 modprobe: ERROR: ../libkmod/libkmod.c:556 kmod_search_moddep() could not open moddep file ‘/lib/modules/3.19.0-26-generic/modules.dep.bin’
Nov 30 15:25:39 node-2 Keepalived_vrrp[14396]: Configuration is using : 63166 Bytes
Nov 30 15:25:39 node-2 Keepalived_vrrp[14396]: Using LinkWatch kernel netlink reflector…
Nov 30 15:25:39 node-2 Keepalived_vrrp[14396]: VRRP_Instance(V1) Entering BACKUP STATE
Nov 30 15:25:39 node-2 Keepalived_healthcheckers[14395]: IPVS: Can’t initialize ipvs: Protocol not available
Nov 30 15:25:39 node-2 Keepalived[14393]: Healthcheck child process(14395) died: Respawning

Solution:

sudo modprobe ip_vs

service keepalived restart

Further Details will be updated, stay tuned.

 

 

Advertisements

Read Full Post »

What is FitPC2i ?

fit-PC2 is a miniature fanless PC based on Atom CPU. It is extremely small and extremely energy efficient, but still packs the full set of PC features. fit-PC2 is made of an embedded grade motherboard in a die-cast aluminum shell. Here is FitPC2i Spec.

Step0: Install Ubuntu 12.04.5 Linux(32-bit)
Install Ubuntu 12.04-5 Server OS into FitPC2i from here

Step1: AP Mode supported?
Verify your wireless adapter supports Access Point mode. Install “iw” tool to verify the AP mode support. Execute following command to know the same

sudo apt-get -y install iw
iw list | grep -8 “Supported interface modes:”

max scan IEs length: 2257 bytes
Coverage class: 0 (up to 0m)
Supported Ciphers:
* WEP40 (00-0f-ac:1)
* WEP104 (00-0f-ac:5)
* TKIP (00-0f-ac:2)
* CCMP (00-0f-ac:4)
Available Antennas: TX 0 RX 0
Supported interface modes:
* IBSS
* managed
* AP
* AP/VLAN
* WDS
* monitor
* mesh point
software interface modes (can always be added):

If you are able to see “AP” in the supported modes, then your Wi-Fi interface(wlan0) can act as a Access Point using hostapd.

Step2:Install dependency packages
sudo apt-get install -y libnl-3-dev libssl-dev

Step3: Compiling Hostapd-2.3 from source code
wget http://w1.fi/releases/hostapd-2.3.tar.gz
tar zxvf hostapd-2.3.tar.gz
cd hostapd-2.3/hostapd

#copy the default config file like we used to copy the kernel configuration file before build.
cp defconfig .config

#Add this line to “.config” file CONFIG_LIBNL32=y
make
.. .. .. CC ../src/drivers/driver_common.c /usr/bin/ld: cannot find -lnl-genl-3 collect2: ld returned 1 exit status make: *** [hostapd] Error 1

Solution
sudo ln -s /lib/libnl-genl-3.so.200.3.0 /lib/libnl-genl-3.so
#Re-make again to complete the compilation
make

#Its Done!, Activate You Own Wi-Fi AP at your Home/Small Office.

Step4: hostapd.conf <– Your AP configurations

#set general/minimum configuration
interface=wlan0
hw_mode=g
driver=nl80211
utf8_ssid=1
ssid=”தமிழ்”
channel=2

Step5: Run hostapd along with hostapd.conf
sudo ./hostapd -d hostapd.conf

Step6: Connect from your Android mobile or laptop and check it.

We will discuss further with more AP configuration details soon.

Read Full Post »