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Biasanya pengguna ubuntu sering mendapatkan informasi pada halaman utama ketika login ke server via cli.
Menginformasikan ada 1 atau 2 atau bahkan lebih zombie process.
Apakah zombie process ..? Seperti dikutip dari blognya mas petra Zombie Process adalah sebuah proses pada sistem operasi yang telah menyelesaikan eksekusinya tetapi terdapat pada entry process.
Informasi jika ingin memastikan zombie process bisa menggunakan command
top -c
dari gambar diatas terlihat 1 zombie process yang sedang aktif, dan berikut cara untuk menemukan dan membunuhnya #dunia-ini-kejam-bung :)
# ps axu |grep Z USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 8414 0.0 0.0 0 0 ? Z 22:00 0:00 [rmacnt] <defunct> root 8417 0.0 0.0 3920 812 pts/0 S+ 22:00 0:00 grep --color=auto Z
Kalkun, begitulah sebutannya, yaitu aplikasi untuk mengirim dan menerima sms berbasis webbased.
Untuk melakukan installasi juga tidak sulit, namun ada beberapa hal yang perlu diketahui.
Saya pernah melakukan installasi aplikasi ini dan berjalan dengan sangat baik, walapun ada beberapa kendala pada saat installasinya yg harus membaca stiap comentar yang dikirim di website resmi developernya, yaitu disini.
Ada beberapa perangkat yang harus disiapkan.
PC Linux Debian
Modem Wavecom (Saya menggunakan wavecom serial + Converter USB)
SIM GSM
Siapkan PC Linux Debian dan diinstall apache2 + php5 + Mysql
Download aplikasi webbased di website http://kalkun.sourceforge.net/ , pada saat artikel ini dibuat versi kalkun masih menggunakan versi 0.7.1
Langkahnya sbb :
Buatkan user kalkun dan database kalkun di mysql, dan sesuaikan di fileapplication/config/database.php
Import database gammu ke database kosong yang sudah dibuat.
Note : untuk database gammu bisa didapat dengan cara melakukan install manual apt-get install gammu-smsd dan import database yang ada di /usr/share/doc/gammu-smsd/examples/mysql.sql.gz
Selanjutnya buka webbrowser untuk menginstall webbased.
Edit file /etc/gammu-smsdrc
# Configuration file for Gammu SMS Daemon
# Gammu library configuration, see gammurc(5) [gammu] port = /dev/ttyUSB1 #sesuaikan dengan kondisi server anda "dmesg" connection = at115200 #disesuaikan dengan modem yang dipakai, cek website gammu # Debugging #logformat = textall
# SMSD configuration, see gammu-smsdrc(5) [smsd] PIN = 1234 Service = SQL Driver = native_mysql logfile = syslog DeliveryReport = sms # Increase for debugging information debuglevel = 1 #rubah ke 255 jika ingin melakukan debug dan perhatikan syslog. User = kalkun_username Password = kalkun_password PC = localhost Database = kalkun_databasename
# Paths where messages are stored inboxpath = /var/spool/gammu/inbox/ outboxpath = /var/spool/gammu/outbox/ sentsmspath = /var/spool/gammu/sent/ errorsmspath = /var/spool/gammu/error/
Jalankan command update-rc.d gammu-smsd defaults agar system gammu-smsd berjalan otomatis.
Jika sudah tampil output seperti diatas, berarti ldap server sudah berhasil, dari output tersebut kita dapat melihat semua informasi tentang user ghulam. Dan artikel tentang ldap ini masih akan berlanjut dengan topik.
kebanyakan dari kita menggunakan sistem operasi berbasis opensouce, seperti ubuntu. tapi kita juga sering menghadapi kendala driver pada ubuntu, seperti driver serial port to usb untuk akses CLI dari suatu device router dan switch. sebelumnya vendor yang menyediakan CLI untuk router dan switch seperti:
1. cisco
2. juniper
3. wifi jenis xirrus dll.
disini saya akan menjelaskan bagaimana cara untuk config agar serial port to usb kita dapat berfungsi untuk akses CLI dari device switch dan router.
1. install minicom lewat terminal, minicom adalah program open source sebagai jembatan komunikasi serial port.
# apt-get install minicom
2. download driver HL-341untuk linux, ini adalah driver untuk converter serial to usb:
3. extract file tersebut kemudian masuk ke directory hasil extract tadi dan install dengan perintah :
# ./ins.sh
4. setelah selasai sekarang saatnya kita uji coba:
Disini saya telah menyambungkan kabel serial to USB kemudian untuk melihat mengecek
apakah HL341-uart telah terkoneksi ke USB, dan pada ttyUSB berapa dengan perintah seperti
gambar dibawah ini:
5. Disana terlihat bahwa terdapat converter pada ttyUSB0, nah selanjutnya kita gunakan perintah minicom untuk konfigurasi masul CLI nya dengan perintah:
# minicom -s
maka akan tampil seperti gambar dibawah ini kemudian pillih serial port setup:
6. Kemudian sesuikan dengan keadaan letak tty USB kita, kalo saya sih tadi kan ada di ttyUSB0 kalo Bps/Par/Bits default untuk cisco adalah 9600 jadi seperti dibawah ini:
Tekan “A” Untuk merubah device yang ingin digunakan ( /dev/ttyUSB3 untuk converter usb to serial — kebetulan ttyUSB yang laen buat modem flash)
Tekan “E” Untuk merubah speed ke “9600′′
Tekan “F” untuk Hardware Flow Control menjadi No
7. Setelah itu untuk keluar tinggal Esc, dan kemudian Save setup as dfl, dan layar CLI pun tampil selamat untuk berconsole .
NB: jika ingin misalkan ingin masuk lagi ke Cli tinggal menggunakan perintah
Pada penggunaan database mysql sering terjadi keadaan dimana kita lupa akan password root dari database mysql yang kita miliki. Ada cara yang bisa dilakukan untuk mengatasi masalah tersebut yaitu mereset secara manual pada konsole terminal. Berikut langkah-langkah melakukan reset password root mysql pada sistem server Linux :
1. Hentikan proses daemon mysql yang sedang berjalan :
# /etc/init.d/mysqld stop
2. Jalankan kembali daemon mysql (mysqld) dengan atribut tambahan –skip-grant-tables option (karakter di depan perintah skip adalah minus-minus) agar kita dapat masuk kedalam mysql tanpa harus menggunakan password :
# mysqld_safe –skip-grant-tables &
3. Masuk kedalam mysql dengan user root :
# mysql -u root
Setelah berhasil login, kita akan berada pada prompt mysql> :
# mysql>
4. Untuk melakukan reset password root, masukan perintah-perintah berikut satu persatu. Perhatikan bahwa kita hanya perlu memasukan perintah setelah prompt mysql> :
mysql> use mysql;
mysql> update user set password=PASSWORD(“NEW-ROOT-PASSWORD”) where User=’root’;
mysql> flush privileges;
mysql> quit
Jangan lupa untuk mengganti atribut “NEW-ROOT-PASSWORD” dengan password baru yang kita kehendaki.
5. hentikanservice mysql :
# /etc/init.d/mysqld stop
6. Kembali jalankan service mysql dan cobalah login kembali kedalam mysql :
VirtualBox adalah salah satu solusi untuk kita dalam mengimplementasikan suatu jaringan komputer jika dalam kehidupan nyata kita tidak mempunyai peralatan yang banyak untuk membangun sebuah jaringan komputer, jadi VirtualBox dapat membantu kita dalam mendesain jaringan tanpa alat nyata yang kita punya melainkan hanya Virtual atau perumpamaan nya saja tanpa ada perubahan dalam konfigurasi nya seperti halnya kita mengkonfigurasi jaringan secara nyata.
Kali ini saya ingin berbagi bagaimana cara mengkoneksiikan antara komputer virtual yang ada di VirtualBox dengan komputer asli (nyata) dan cara mengkoneksikan komputer Virtual dengan Komputer Virtual lainnya.
Komputer Asli > (Host-Only-Adapter) < Komputer Virtual 1 > (Internal Network) <Komputer Virtual 2 > (Internal Network) < Komputer Virtual 3.
Untuk lebih jelasnya dapat dilihat dalam contoh desain jaringan yang saya buat berikut :
Tujuan dari jaringan diatas adalah Client Windows XP harus dapat mengakses seluruh layanan yang ada di Server Debian maupun layanan Router Debian termasuk koneksi Internet. tapi yang saya akan bahas hanya bagaimana cara setting NIC (Network Interface Card) dalam semua komputer VirtualBox yang berada pada jaringan tersebut.
Berikut cara yang harus dilakukan untuk mengatur NIC Virtual semua komputer yang ada dalam jaringan tersebut :
1. Setting NIC Virtual Komputer Asli
Masuk ke menu network connections, sehingga tampil seperti gambar berikut
Kemudian pilih adapter VirtualBox-Host-Only Network
Setelah itu, setting ip address seperti biasa seperti yang anda inginkan misal yang punya saya sbb :
Untuk memastikan sudah terkonfigurasi cek menggunakan perintah ipconfig di cmd
2. Setting NIC Router Debian Virtual (Komputer Virtual 1)
Jalankan Aplikasi VirtualBox sehingga tampil SO yang sudah anda install, misal punya saya sbb :
Pilih Debian Router (Komputer Virtual 1 milik anda), dan pilih pada menu Setting >Network sehingga tampil sbb:
Pastikan Enable,
Attachted to : Host-only Adapter
Name : VirtualBox-Host-Only Ethernet Adapter, agar adapter pertama (eth0)dari mesin VirtualBox Debian router bisa berhubungan dengan adapter VirualBox PC Asli.
Kemudian setting adapter 2 seperti berikut :
Pastikan Enable,
Attachted to : Internal Network
Name : intnet, agar adapter kedua (eth1) dari mesin VirtualBox Debian router bisa berhubungan dengan adapter Mesin VirualBox Debian Server (Komputer Virtual 2).
Klik OK
Sekarang aturlah IP Address pada Komputer Debian Router (Komputer Virtual 1), misal :
Kemudian lakukan pengujian konektivitas dengan cara Pingdari PC Asli ke Debian Router Virtual.
3. Setting NIC Server Debian Virtual (Komputer Virtual 2)
Jalankan Aplikasi VirtualBox sehingga tampil SO yang sudah anda install, misal punya saya sbb :
Pilih Debian Server (Komputer Virtual 2 milik anda), dan pilih pada menu Setting >Network sehingga tampil sbb:
Pastikan Enable,
Attachted to : Internal Network
Name : intnet, agar adapter pertama (eth0) mesin VirtualBox Debian Server bisa berhubungan dengan adapter Mesin VirualBox Debian Router (Komputer Virtual 1).
Kemudian setting adapter 2 seperti berikut :
Pastikan Enable,
Attachted to : Internal Network
Name : intnet, agar adapter kedua (eth1) dari mesin VirtualBox Debian Server bisa berhubungan dengan adapter Mesin VirualBox Client Windows XP (Komputer Virtual 3).
Klik OK
Sekarang aturlah IP Address pada Komputer Debian Server (Komputer Virtual 2), misal :
Kemudian lakukan pengujian konektivitas dengan cara Pingdari PC Server ke Debian Router Virtual atau Sebaliknya.
4. Setting NIC Client Windows XP (Komputer Virtual 3)
Pastikan Enable,
Attachted to : Internal Network
Name : intnet, agar adapter pertama (eth0) dari mesin Client Windows XP VirtualBox bisa berhubungan dengan adapter Mesin VirualBox Debian Server (Komputer Virtual 2).
Klik OK
Sekarang aturlah IP Address pada Komputer Client Windows XP VirtualBox(Komputer Virtual 3)
Kemudian lakukan pengujian konektivitas dengan cara Pingdari Komputer Client Windows XP VirtualBox ke PC Server Debian VirtualBox .
Cukup sekian sedikit pembahasan mengenai Setting Jaringan di VirtualBox, mudah-mudahan bermanfaat khususnya bagi saya dan umumnya bagi para pembaca.