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20151117-1 选题
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N1: The Next Generation Open Source Email Client
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================================================================================
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When we talk of email clients for Linux, generally the name of [Thunderbird][1], [Geary][2] and [Evolution][3] come to our mind. To challenge the authority of these big players, a new open source email client is entering the market.
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### Design plus features ###
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[N1][4] is the next generation open source email client which has equal focus on design and features. An open source software, N1 is available for Linux and Mac OS X with a Windows desktop application in the pipeline.
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N1 promotes itself as “extensible open source email client” because it includes a JavaScript plugin architecture that enables anyone to create powerful new features. Extensibility is a heavily popular feature that helped [open source code editor Atom][5] to gain popularity. N1 is also putting emphasis on it.
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Apart from extensibility, N1 has also focused on the looks and design of the application. A look at the screenshot of N1 is a good enough example:
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N1 email client on Mac OS X. Picture Credit: N1
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In other features, N1 is compatible with hundreds of email providers, including Gmail, Yahoo, iCloud, Microsoft Exchange etc. Desktop app provides offline capability.
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### For now, invite only ###
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I don’t know why everyone is following OnePlus’ “exclusive invite only” marketing strategy? At present, N1 desktop app can be downloaded only when you are invited. You can request an invite using the link below. N1 team will email you the download link in a few days.
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- [Request an invite for N1][6]
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### Intriguing? ###
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I am not a big fan of desktop email clients, but N1 has definitely caught my attention and I am willing to give it a try. How about you?
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--------------------------------------------------------------------------------
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via: http://itsfoss.com/n1-open-source-email-client/
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作者：[Abhishek][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://itsfoss.com/author/abhishek/
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[1]:https://www.mozilla.org/en-US/thunderbird/
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[2]:https://wiki.gnome.org/Apps/Geary
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[3]:https://help.gnome.org/users/evolution/stable/
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[4]:https://nylas.com/N1/
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[5]:http://itsfoss.com/atom-stable-released/
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[6]:https://invite.nylas.com/download
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Install PostgreSQL 9.4 And phpPgAdmin On Ubuntu 15.10
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================================================================================
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### Introduction ###
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[PostgreSQL][1] is a powerful, open-source object-relational database system. It runs under all major operating systems, including Linux, UNIX (AIX, BSD, HP-UX, SGI IRIX, Mac OS, Solaris, Tru64), and Windows OS.
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Here is what **Mark Shuttleworth**, the founder of **Ubuntu**, says about PostgreSQL.
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> Postgres is a truly awesome database. When we started working on Launchpad I wasn’t sure if it would be up to the job. I was so wrong. It’s been robust, fast, and professional in every regard.
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>
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> — Mark Shuttleworth.
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In this handy tutorial, let us see how to install PostgreSQL 9.4 on Ubuntu 15.10 server.
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### Install PostgreSQL ###
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PostgreSQL is available in the default repositories. So enter the following command from the Terminal to install it.
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sudo apt-get install postgresql postgresql-contrib
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If you’re looking for other versions, add the PostgreSQL repository, and install it as shown below.
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The **PostgreSQL apt repository** supports LTS versions of Ubuntu (10.04, 12.04 and 14.04) on amd64 and i386 architectures as well as select non-LTS versions(14.10). While not fully supported, the packages often work on other non-LTS versions as well, by using the closest LTS version available.
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#### On Ubuntu 14.10 systems: ####
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Create the file **/etc/apt/sources.list.d/pgdg.list**;
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sudo vi /etc/apt/sources.list.d/pgdg.list
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Add a line for the repository:
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deb http://apt.postgresql.org/pub/repos/apt/ utopic-pgdg main
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**Note**: The above repository will only work on Ubuntu 14.10. It is not updated yet to Ubuntu 15.04 and 15.10.
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**On Ubuntu 14.04**, add the following line:
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deb http://apt.postgresql.org/pub/repos/apt/ trusty-pgdg main
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**On Ubuntu 12.04**, add the following line:
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deb http://apt.postgresql.org/pub/repos/apt/ precise-pgdg main
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Import the repository signing key:
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wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc
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----------
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sudo apt-key add -
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Update the package lists:
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sudo apt-get update
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Then install the required version.
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sudo apt-get install postgresql-9.4
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### Accessing PostgreSQL command prompt ###
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The default database name and database user are “**postgres**”. Switch to postgres user to perform postgresql related operations:
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sudo -u postgres psql postgres
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#### Sample Output: ####
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psql (9.4.5)
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Type "help" for help.
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postgres=#
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To exit from posgresql prompt, type **\q** in the **psql** prompt return back to the Terminal.
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### Set “postgres” user password ###
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Login to postgresql prompt,
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sudo -u postgres psql postgres
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.. and set postgres password with following command:
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postgres=# \password postgres
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Enter new password:
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Enter it again:
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postgres=# \q
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To install PostgreSQL Adminpack, enter the command in postgresql prompt:
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sudo -u postgres psql postgres
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----------
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postgres=# CREATE EXTENSION adminpack;
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CREATE EXTENSION
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Type **\q** in the **psql** prompt to exit from posgresql prompt, and return back to the Terminal.
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### Create New User and Database ###
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For example, let us create a new user called “**senthil**” with password “**ubuntu**”, and database called “**mydb**”.
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sudo -u postgres createuser -D -A -P senthil
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----------
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sudo -u postgres createdb -O senthil mydb
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### Delete Users and Databases ###
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To delete the database, switch to postgres user:
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sudo -u postgres psql postgres
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Enter command:
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$ drop database <database-name>
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To delete a user, enter the following command:
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$ drop user <user-name>
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### Configure PostgreSQL-MD5 Authentication ###
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**MD5 authentication** requires the client to supply an MD5-encrypted password for authentication. To do that, edit **/etc/postgresql/9.4/main/pg_hba.conf** file:
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sudo vi /etc/postgresql/9.4/main/pg_hba.conf
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Add or Modify the lines as shown below
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[...]
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# TYPE DATABASE USER ADDRESS METHOD
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# "local" is for Unix domain socket connections only
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local all all md5
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# IPv4 local connections:
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host all all 127.0.0.1/32 md5
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host all all 192.168.1.0/24 md5
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# IPv6 local connections:
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host all all ::1/128 md5
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[...]
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Here, 192.168.1.0/24 is my local network IP address. Replace this value with your own address.
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Restart postgresql service to apply the changes:
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sudo systemctl restart postgresql
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Or,
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sudo service postgresql restart
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### Configure PostgreSQL-Configure TCP/IP ###
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By default, TCP/IP connection is disabled, so that the users from another computers can’t access postgresql. To allow to connect users from another computers, Edit file **/etc/postgresql/9.4/main/postgresql.conf:**
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sudo vi /etc/postgresql/9.4/main/postgresql.conf
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Find the lines:
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[...]
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#listen_addresses = 'localhost'
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[...]
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#port = 5432
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[...]
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Uncomment both lines, and set the IP address of your postgresql server or set ‘*’ to listen from all clients as shown below. You should be careful to make postgreSQL to be accessible from all remote clients.
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[...]
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listen_addresses = '*'
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[...]
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port = 5432
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[...]
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Restart postgresql service to save changes:
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sudo systemctl restart postgresql
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Or,
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sudo service postgresql restart
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### Manage PostgreSQL with phpPgAdmin ###
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[**phpPgAdmin**][2] is a web-based administration utility written in PHP for managing PosgreSQL.
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phpPgAdmin is available in default repositories. So, Install phpPgAdmin using command:
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sudo apt-get install phppgadmin
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By default, you can access phppgadmin using **http://localhost/phppgadmin** from your local system’s web browser.
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To access remote systems, do the following.
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On Ubuntu 15.10 systems:
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Edit file **/etc/apache2/conf-available/phppgadmin.conf**,
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sudo vi /etc/apache2/conf-available/phppgadmin.conf
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Find the line **Require local** and comment it by adding a **#** in front of the line.
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#Require local
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And add the following line:
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allow from all
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Save and exit the file.
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Then, restart apache service.
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sudo systemctl restart apache2
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On Ubuntu 14.10 and previous versions:
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Edit file **/etc/apache2/conf.d/phppgadmin**:
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sudo nano /etc/apache2/conf.d/phppgadmin
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Comment the following line:
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[...]
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#allow from 127.0.0.0/255.0.0.0 ::1/128
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Uncomment the following line to make phppgadmin from all systems.
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allow from all
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Edit **/etc/apache2/apache2.conf**:
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sudo vi /etc/apache2/apache2.conf
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Add the following line:
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Include /etc/apache2/conf.d/phppgadmin
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Then, restart apache service.
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sudo service apache2 restart
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### Configure phpPgAdmin ###
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Edit file **/etc/phppgadmin/config.inc.php**, and do the following changes. Most of these options are self-explanatory. Read them carefully to know why do you change these values.
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sudo nano /etc/phppgadmin/config.inc.php
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Find the following line:
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$conf['servers'][0]['host'] = '';
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Change it as shown below:
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$conf['servers'][0]['host'] = 'localhost';
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And find the line:
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$conf['extra_login_security'] = true;
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Change the value to **false**.
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$conf['extra_login_security'] = false;
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Find the line:
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$conf['owned_only'] = false;
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Set the value as **true**.
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$conf['owned_only'] = true;
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Save and close the file. Restart postgresql service and Apache services.
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sudo systemctl restart postgresql
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----------
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sudo systemctl restart apache2
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Or,
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sudo service postgresql restart
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sudo service apache2 restart
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Now open your browser and navigate to **http://ip-address/phppgadmin**. You will see the following screen.
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Login with users that you’ve created earlier. I already have created a user called “**senthil**” with password “**ubuntu**” before, so I log in with user “senthil”.
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Now, you will be able to access the phppgadmin dashboard.
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Log in with postgres user:
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That’s it. Now you’ll able to create, delete and alter databases graphically using phppgadmin.
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Cheers!
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--------------------------------------------------------------------------------
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via: http://www.unixmen.com/install-postgresql-9-4-and-phppgadmin-on-ubuntu-15-10/
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作者：[SK][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://www.twitter.com/ostechnix
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[1]:http://www.postgresql.org/
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[2]:http://phppgadmin.sourceforge.net/doku.php
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