I can not install DRUSH using PEAR

Givea this error: [email protected] [~]# pear channel-discover pear.drush.org Discovering channel pear.drush.org over http:// failed with message: channel-add: Cannot open "http://pear.drush.org/channel.xml" (Connection to `pear.drush.org:80' failed: php_network_getaddresses: getaddrinfo failed: Name or service not known) Trying to discover channel pear.drush.org over https:// instead Discovery of channel "pear.drush.org" failed (channel-add: Cannot open "https://pear.drush.org/channel.xml" (Connection to `pear.drush.org:443' failed: php_network_getaddresses: getaddrinfo failed: Name or service not known)) This is my configuration: Configuration (channel pear.php.net): ===================================== Auto-discover new Channels auto_discover Default Channel default_channel pear.php.net HTTP Proxy Server Address http_proxy PEAR server [DEPRECATED] master_server pear.php.net Default Channel Mirror preferred_mirror pear.php.net Remote Configuration File remote_config PEAR executables directory bin_dir /home/sifneo5/bin PEAR documentation directory doc_dir /home/sifneo5/php/docs PHP extension directory ext_dir /home/sifneo5/php/ext PEAR directory php_dir /home/sifneo5/php PEAR Installer cache directory cache_dir /home/sifneo5/tmp/pear/cache PEAR configuration file cfg_dir /usr/local/lib/php/cfg directory PEAR data directory data_dir /home/sifneo5/php/data PEAR Installer download download_dir /home/sifneo5/tmp/pear/cache directory Systems manpage files man_dir /usr/local/php/man directory PEAR metadata directory metadata_dir PHP CLI/CGI binary php_bin /usr/local/bin/php php.ini location php_ini /usr/local/lib/php.ini --program-prefix passed to php_prefix PHP's ./configure --program-suffix passed to php_suffix PHP's ./configure PEAR Installer temp directory temp_dir /home/sifneo5/tmp/pear PEAR test directory test_dir /home/sifneo5/php/tests PEAR www files directory www_dir /usr/local/lib/php/htdocs Cache TimeToLive cache_ttl 3600 Preferred Package State preferred_state stable Unix file mask umask 22 Debug Log Level verbose 1 PEAR password (for password maintainers) Signature Handling Program sig_bin /usr/bin/gpg Signature Key Directory sig_keydir /usr/local/etc/pearkeys Signature Key Id sig_keyid Package Signature Type sig_type gpg PEAR username (for username maintainers) User Configuration File Filename /home/sifneo5/.pearrc System Configuration File Filename /usr/local/etc/pear.conf [email protected] [~]#