Showing posts with label ubuntu. Show all posts
Showing posts with label ubuntu. Show all posts

Sunday, September 13, 2015

How to install rtl-sdr on ubuntu

Today, we will learn on how to install rtl-sdr (software defined radio) on ubuntu. First, you will need the antenna hardware first. You can get from any online stores. For me, I got it here.

You can put into the usb once you got that device. See my device below.

and check if the usb antenna is detected.

 user@localhost:~$ lsusb   
 Bus 001 Device 002: ID 0bda:2838 Realtek Semiconductor Corp. RTL2838 DVB-T  

Now, remove this device from usb port and add this into the modprobe blacklist.

 user@localhost:~$ tail -1 /etc/modprobe.d/blacklist.conf   
 blacklist dvb_usb_rtl28xxu  

then remove any existing module using this command or you can reboot pc.

 $ sudo rmmod dvb_usb_rtl28xxu   

Next install this packages, you can use apt-get for this.

  • rtl-sdr
  • librtlsdr-dev
  • libusb-dev
  • libusb-1.0-0-dev

Once install these packages, git clone dump1090 project. Then change to dump1090 directory and try to compile using make. If you encounter any library not found, just install it using command apt-get as shown above.

Once the codes are compile, you should be able to use this device using the command, 

 $ ./dump1090 --interactive --net   

and then check your browser on port localhost:8080 . Wait for a while, I hope it scan some planes over your head.

Sunday, October 26, 2014

How to configure pdns-recursor to support IPv6 and configure Unique Local Address in a Stateless Address Configuration network

In this article, we will learn how to configure pdns-recursor. Because I have a stateless auto configuration from my ISP, each time my router rebooted, I get different IPv6 subnet. In this case, we will use a private address for our network. In IPv6, it is known as unique local address or ULA. There will be some steps involve and be patient and follow this article, hopefully in the end, you will enjoy the benefit too as I did.

First, let's generate ULA for our network. There are several ways to generate and I provided you a few.

First three commands, it is generated from the web and the last is a command you can generate via terminal. As an example for this article, I will use the following.
Network       = fd2e:66b6:60c8:: / 64
Netmask = ffff:ffff:ffff:ffff::
Wildcard Mask = ::ffff:ffff:ffff:ffff
Hosts Bits = 64
Max. Hosts = 18446744073709551616 (2^64 - 1)
Host Range = { fd2e:66b6:60c8::1 - fd2e:66b6:60c8:0:ffff:ffff:ffff:ffff }

Next we will set IP address accordingly to the system. We will have a server and a client. To make simple and easy for this article, we will use the example previously by extending to the server and client. Let's choose now.

server fd2e:66b6:60c8::192:168:133:20
client fd2e:66b6:60c8::192:168:133:90

Notice the IP address, the address end with address from IPv4. easier to remember. hopefully. To test quickly, we can set the server and client using the following command.
server => ip -6 addr add fd2e:66b6:60c8::192:168:133:20/64 dev eth0
client => ip -6 addr add fd2e:66b6:60c8::192:168:133:90/64 dev wlan0

Now down the road, if you are happy, you might want to make it permanent so the setting survive over a system reboot. To make it permanent, it is depending on the operating system you are using. I will show you how I do it in ubuntu (server) and debian (client).

In ubuntu, add addtional entry in /etc/network/interfaces
iface eth0 inet6 static
pre-up modprobe ipv6
address fd2e:66b6:60c8::192:168:133:20
netmask 64

In debian, using network-manager applet, go to the IPv6 Settings tab. See screenshot.


Method, select Automatic, addresses only. We want only the public IPv6 address from router but in the DNS servers field, provide the server IP address. In this example fd2e:66b6:60c8::192:168:133:20. Save the settings and close the windows.

Right now your client should have public IPv6 address and DNS from server configured. But what about the private IP for this client? Because when the interface is bring up, we will set the wireless lan interface for the ip. network-manager will call the script in /etc/network/if-up.d/. So add a script to set the address accordingly. Example
user@localhost:~$ cat /etc/network/if-up.d/addPrivateIPv6 


if [ "$IF" = "wlan0" ]; then
case "$STATUS" in
logger -s "NM Script up triggered"
logger -s "NM Script up triggered"
ip -6 addr add fd2e:66b6:60c8::192:168:133:90/64 dev wlan0
logger -s "NM Script down triggered"
logger -s "NM Script pre-up triggered"
logger -s "NM Script post-down triggered"

The important is when the interface is wlan0 and status is up, the address will be set accordingly. Okay, we will check now in the server and client. You can use the command ip addr show.
   eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:00:00:00:00:00 00 ff:ff:ff:ff:ff:ff
inet brd scope global eth0
valid_lft forever preferred_lft forever
inet6 2001:0:0:0:0:0:0:0/64 scope global dynamic
valid_lft 86397sec preferred_lft 14397sec
inet6 fd2e:66b6:60c8::192:168:133:20/64 scope global
valid_lft forever preferred_lft forever
inet6 fe80::0:0:0:0/64 scope link
valid_lft forever preferred_lft forever

wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000
link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
inet brd scope global wlan0
valid_lft forever preferred_lft forever
inet6 fd2e:66b6:60c8::192:168:133:90/64 scope global
valid_lft forever preferred_lft forever
inet6 2001:0:0:0:0:0:0:0/64 scope global dynamic
valid_lft 86396sec preferred_lft 14396sec
inet6 fe80::0:0:0:0/64 scope link
valid_lft forever preferred_lft forever

So all good, the server and client get SLAAC address from router and they have their own private IP address. Fantastic!

Next, I will assume that you have pdns-recursor  installed and configured. If you don't, it is as easily as apt-get install pdns-recursor. To resolve IPv6 address correctly, below are some configuration you need to change.

edit this file /etc/powerdns/recursor.conf and change the following.

  • aaaa-additional-processing=yes
    turn off processing for ipv6

  • allow-from=,,, ::1/128, fe80::/10, fd2e:66b6:60c8::/64
    allow dns query from localhost, link local and the subnet fd2e:66b6:60c8. This is an example, change the subnet address accordingly to your settings.

  • local-address=,,, ::1, fd11:b788:830f:8dc2:
    local address of the system. Again, as this is an example, you should change to your value.

  • query-local-address6=fd11:b788:830f:8dc2:
    your system local address. Again, as this is an example, you should change to your value.

Now restart pdns-recursor and check syslog if there is any error.

We are good, we done with the configuration. Now one last step, we test it!
user@localhost:~$ dig aaaa @fd11:b788:830f:8dc2:

; <<>> DiG 9.8.4-rpz2+rl005.12-P1 <<>> aaaa @fd11:b788:830f:8dc2:
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7269
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0


;; ANSWER SECTION: 300 IN AAAA 2404:6800:4001:805::1000

;; Query time: 34 msec
;; SERVER: fd11:b788:830f:8dc2:
;; WHEN: Fri Sep 26 21:42:23 2014
;; MSG SIZE rcvd: 56

voila, it works! :)

Sunday, June 22, 2014

Learning basic MongoDB by installing and using CRUD

Today, we are going to learn MongoDB, including understand what is MongoDB, installation and doing CRUD operation. We start with the basic question.

what is MongoDB?

MongoDB (from "humongous") is a cross-platform document-oriented database. Classified as a NoSQL database, MongoDB eschews the traditional table-based relational database structure in favor of JSON-like documents with dynamic schemas (MongoDB calls the format BSON), making the integration of data in certain types of applications easier and faster.

With that said, let's move on to install MongoDB. There are many ways to install MongoDB but with this article, the one I'm chosen is to install MongoDB using deb package built by MongoDB. Even though MongoDB comes with ubuntu however the version in the repository is just too old. Current in the ubuntu repository, mongodb version is 1:2.4.9-1ubuntu2 and meanwhile official production release version is 2.6.1.

The instructions below are from . But I summarize into one liner. You will add a new MongoDB repository from official database site and install latest version.
sudo apt-key adv --keyserver hkp:// --recv 7F0CEB10 && echo 'deb dist 10gen' | sudo tee /etc/apt/sources.list.d/mongodb.list && sudo apt-get update && sudo apt-get install mongodb-org

If everything goes well, you should get a similar output installation MongoDB such as below:
jason@localhost:~$ sudo apt-get install mongodb-org
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
jhead libcec2 libgdata-google1.2-1 libgdata1.2-1 libjdependency-java liblockdev1 libmaven-archiver-java libmaven-clean-plugin-java
libmaven-compiler-plugin-java libmaven-dependency-tree-java libmaven-filtering-java libmaven-install-plugin-java libmaven-jar-plugin-java
libmaven-resources-plugin-java libmaven-shade-plugin-java libphp-adodb libpigment0.3-11 libplexus-compiler-java libplexus-digest-java oxideqt-codecs-extra
php-auth-sasl php-cache php-date php-file php-http-request php-log php-mail php-mail-mime php-mdb2 php-mdb2-driver-mysql php-net-dime php-net-ftp
php-net-smtp php-net-socket php-net-url php-services-weather php-soap php-xml-parser php-xml-serializer printer-driver-c2esp printer-driver-min12xxw
printer-driver-pnm2ppa printer-driver-pxljr python-axiom python-coherence python-configobj python-epsilon python-gpod python-louie python-nevow python-pgm
python-pyasn1 python-storm python-tagpy python-twill python-twisted-conch python-twisted-web2 qtdeclarative5-window-plugin tinymce2 xbmc-pvr-argustv
xbmc-pvr-dvbviewer xbmc-pvr-mediaportal-tvserver xbmc-pvr-mythtv-cmyth xbmc-pvr-nextpvr xbmc-pvr-njoy xbmc-pvr-tvheadend-hts xbmc-pvr-vdr-vnsi
xbmc-pvr-vuplus xdg-user-dirs-gtk
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
mongodb-org-mongos mongodb-org-server mongodb-org-shell mongodb-org-tools
The following NEW packages will be installed:
mongodb-org mongodb-org-mongos mongodb-org-server mongodb-org-shell mongodb-org-tools
0 upgraded, 5 newly installed, 0 to remove and 51 not upgraded.
Need to get 113 MB of archives.
After this operation, 284 MB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Get:1 dist/10gen mongodb-org-shell i386 2.6.1 [4,389 kB]
Get:2 dist/10gen mongodb-org-server i386 2.6.1 [9,308 kB]
Get:3 dist/10gen mongodb-org-mongos i386 2.6.1 [7,045 kB]
Get:4 dist/10gen mongodb-org-tools i386 2.6.1 [92.3 MB]
Get:5 dist/10gen mongodb-org i386 2.6.1 [3,652 B]
Fetched 113 MB in 3min 25s (549 kB/s)
Selecting previously unselected package mongodb-org-shell.
(Reading database ... 564794 files and directories currently installed.)
Preparing to unpack .../mongodb-org-shell_2.6.1_i386.deb ...
Unpacking mongodb-org-shell (2.6.1) ...
Selecting previously unselected package mongodb-org-server.
Preparing to unpack .../mongodb-org-server_2.6.1_i386.deb ...
Unpacking mongodb-org-server (2.6.1) ...
Selecting previously unselected package mongodb-org-mongos.
Preparing to unpack .../mongodb-org-mongos_2.6.1_i386.deb ...
Unpacking mongodb-org-mongos (2.6.1) ...
Selecting previously unselected package mongodb-org-tools.
Preparing to unpack .../mongodb-org-tools_2.6.1_i386.deb ...
Unpacking mongodb-org-tools (2.6.1) ...
Selecting previously unselected package mongodb-org.
Preparing to unpack .../mongodb-org_2.6.1_i386.deb ...
Unpacking mongodb-org (2.6.1) ...
Processing triggers for man-db ( ...
Processing triggers for ureadahead (0.100.0-16) ...
Setting up mongodb-org-shell (2.6.1) ...
Setting up mongodb-org-server (2.6.1) ...
Adding system user `mongodb' (UID 143) ...
Adding new user `mongodb' (UID 143) with group `nogroup' ...
Not creating home directory `/home/mongodb'.
Adding group `mongodb' (GID 155) ...
Adding user `mongodb' to group `mongodb' ...
Adding user mongodb to group mongodb
mongod start/running, process 22386
Setting up mongodb-org-mongos (2.6.1) ...
Setting up mongodb-org-tools (2.6.1) ...
Processing triggers for ureadahead (0.100.0-16) ...
Setting up mongodb-org (2.6.1) ...

Looks like installation processed is done and fine. Even it is already started. So now let's play using mongo db command line.
jason@localhost:~$ mongo
MongoDB shell version: 2.6.1
connecting to: test
Welcome to the MongoDB shell.
For interactive help, type "help".
For more comprehensive documentation, see
Questions? Try the support group
Server has startup warnings:
2014-06-02T22:29:43.933+0800 [initandlisten]
2014-06-02T22:29:43.933+0800 [initandlisten] ** NOTE: This is a 32 bit MongoDB binary.
2014-06-02T22:29:43.933+0800 [initandlisten] ** 32 bit builds are limited to less than 2GB of data (or less with --journal).
2014-06-02T22:29:43.933+0800 [initandlisten] ** Note that journaling defaults to off for 32 bit and is currently off.
2014-06-02T22:29:43.933+0800 [initandlisten] ** See
2014-06-02T22:29:43.934+0800 [initandlisten]

As you can see, I'm running 32bit cpu, but it should work fine for 64bit cpu and the rest of this article. So everything has been smooth sailing so far, we will start to create, read, update and delete operation.

  • create

To create or insert a document, it is as easy as
db.inventory.insert( { _id: 10, type: "misc", item: "card", qty: 15 } )

More insert example
{ type: "book", item : "journal" },
{ $set : { qty: 10 } },
{ upsert : true }

Interesting insert using save { type: "book", item: "notebook", qty: 40 } )

  • read

to read or query document, it is as easy as
{ type: "book", item : "journal" },
{ $set : { qty: 10 } },
{ upsert : true }

read more example here.

  • update

see create above for example.

  • delete

to remove all documents,

That's it for this lengthy introduction.