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Typical total cost of Upwork CentOS projects based on completed and fixed-price jobs.

Upwork CentOS Jobs Completed Quarterly

On average, 131 CentOS projects are completed every quarter on Upwork.

131

Time to Complete Upwork CentOS Jobs

Time needed to complete a CentOS project on Upwork.

Average CentOS Freelancer Feedback Score

CentOS Upwork freelancers typically receive a client rating of 4.86.

4.86
Last updated: September 1, 2015
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  1. Denis C.

    Denis C.

    Expert System Engineer

    Moldova - Tests: 9

    PROFILE – A self-motivated and committed system administrator with exposure to a wide range of technical areas, focused on delivering best experience to the end-users – Nine years of experience in administering business–critical application stacks such as banking software, middle-ware, billing systems, Telecom-specific applications; troubleshooting complex issues, managing both production environments and databases of highly respected companies – Performed upgrades planning, software developing and documenting the knowledge – Highly adaptable and quick to learn new skills – Six years of customer service experience MAIN TECHNICAL SKILLS O/S: HP-UX, SunOS, AIX, RedHat, CentOS, Debian – installation/configuration Software: MySql Server – installation/configuration Apache Web Server – installation/configuration Nginx – installation/configuration Apache Tomcat – installation/configuration Redhat JBoss Application Server – maintenance Oracle WebLogic Application Server – maintenance Oracle Tuxedo – maintenance Oracle Database – maintenance CVS – codebase maintenance HP Quality Centre – configuration/maintenance SSH Server – installation/configuration Telecom–specific Billing Applications (Amdocs Ensemble, Oracle BRM) – maintenance Oracle VM VirtualBox – installation/configuration Languages: Python – 1.5 years Perl – 3 years AWK – 4 years Shell Scripting – 5 years SQL (mysql and Oracle) – 4 years Java – 0.5 years PROFESSIONAL EXPERIENCE – Billing System Engineer, Team Lead (3 persons in submission): 2010 - 2013 – Software Developer: 2008 – 2010 – Senior System Engineer: 2003 – 2008

    $16.67 /hr
    0 hours
    0.00
  2. Artem Lalaiants

    Artem Lalaiants

    Linux System Administrator

    Ukraine - Tests: 3 - Portfolio: 2

    I'm a highly competent and organized Linux System Administrator with more than 4 years of experience in Linux Administration, hosting environment and maintenance of production and development servers. In-depth knowledge in management and configuration of Linux based servers, development of HA systems and security policies. Fascinated with automation of processes in shell and Python. - Linux maintenance (CentOS, Debian, Ubuntu, CoreOS, RHEL); - Cloud hosting (Amazon EC2, RDS, S3, DigitalOcean Droplets); - Virtualization: (VirtualBox, Vmware, Openvz, Xen); - Web servers (apache, nginx); - Databases (MySQL, PostgresQL); - Monitoring (zabbix, nagios) - Mail servers (postfix, sendmail, antispam/ antivirus: clamav/spamassassin/amavis, courier, dovecot); - Networking (DHCP, DNS, VPN, OpenVPN, firewalls: iptables/ipfw, qos, proxies); - Python programming. Graduated from V.N. Karazin Kharkiv National University, Kharkiv, Ukraine, Department of Complex Information Technologies. Have a master's degree.

    $10.00 /hr
    0 hours
    0.00
  3. Panayotis Tsiamis

    Panayotis Tsiamis

    Senior Systems and Software Engineer

    Greece - Tests: 7 - Portfolio: 14

    Systems and Services Engineer, with 12+ years of working experience. Interested in researching, administrating, debugging, tuning and developing platforms running on UNIX like Operating Systems. Able to troubleshoot, identify and solve problems in software, network or kernel layer. Always willing to learn and experiment new technologies for creating high availliability platforms, that could described as "state of the art" or "cutting edge" technology. Specialties: • Unix Like Operating Systems Specialist (Solaris / Linux ). • TCP/IP Network technology • Very deep level of knowledge on Machines hardware and OS Kernels internals. • Troubleshoot/Tune/Debug; System Services, Operating Systems • Mail Services Expert, Qmail-Ldap Specialist. • Network: Cacti/MRTG, Nagios, Cisco Netflow • Databases: PostgreSQL / MySQL / Oracle / LDAP. • Programming: Perl, Ansi C, bash, awk, sed, php etc • Internet Services: mail, http, radius, ftp, ssh, irc etc.

    $30.00 /hr
    443 hours
    0.00
  4. Sergey Kogut

    Sergey Kogut

    Sr Windows and Linux Systems Admininstrator

    Ukraine - Tests: 1

    Hello, I'm a System Administrator with 11+ years experience. I have worked earlier with hosting companies like hostpro.ua, 1gb.ua, hostclear.com, justhost.com and SingleHop.com. I've great experience with WordPress, cPanel/WHM, Plesk and server configuration (Bind, Postfix, Apache, MySQL, FTP and etc) + Virtualization OpenVZ Also I know CentOS and Ubuntu rather good (installation and configuration of software like ffmpeg, 3dproxy, Maldet, OpenVPN, Bugzilla and etc) Also I've a good experience with Nginx + PHP-FPM + Nginx Cache + Varnish Cache Currently I work remotely as a system/server administrator at RipaMedia Inc. I love my job and also I like to help people like you :)

    Groups: Bluehost Developers and Designers

    $22.22 /hr
    144 hours
    4.90
  5. Daniel Yavorovich

    Daniel Yavorovich

    System Administrator

    Ukraine - Portfolio: 1

    Operating Systems ● FreeBSD ● Linux Security ● iptables ● openssl ● jail ● clamav ● mod_security ● mod_clamav DNS ● Bind ● PowerDNS (+PostgreSQL / +MySQL) HTTP ● Apache ○ MPM: prefork, worker ○ mod_ssl, mod_php, mod_wsgi ● Nginx ○ Access control ○ Autoindex ○ Fast-CGI ○ uWSGI ○ Proxy ○ Cache ○ SSL ○ upload_progress_module ○ Control panel integration ■ Virtualmin ■ DirectAdmin ■ Plesk Proxy ● squid ○ basic auth ○ transparent proxy ○ cache ● 3proxy ○ http/socks ○ auth Raid ● Linux ○ md(0,1,5,6,10) ● FreeBSD ○ Gmirror / Striping File Systems: ● Ext 2,3,4 ● ReiserFS ● XFS ● OCFS2 ● ZFS (port to FreeBSD) ● CEPH CVS ● SVN ● Mercurial ● GIT ○ GitLab ○ GitoLite Backup ● rsync ● BackupPC ● Bacula FTP ● ProFTPd ● VSFTPD File sharing ● NFS ● SAMBA Control Panel ● Direct Admin ● Webmin+Virtualmin ● CPanel ● ISP-config ● Plesk Automatization ● Puppet ● Saltstack Monitoring ● Zabbix ● Nagios ● Munin ● Monit Network Understanding of theoretical and practical foundations of the networks (Data link, Network, Transport, Application Layers). VPN ● OpenVPN ● PPTP Database (SQL) ● MySQL (+MariaDB, +Percona) ● PostgreSQL Database (NoSQL) ● ElasticSearch ● Riak ● MongoDB ● Cassandra ● Redis Virtualization & Containerization ● KVM ● XEN ● OpenVZ ● LXC ● Docker ● Vagrant Cluster ● DRBD ○ master-slave ○ master-master (+ocfs2) ● Heartbeat ● Pacemaker Development ● actively use: ○ shell (bash, sh) ○ Python ● Frameworks ○ Django ○ Flask ○ Twisted ○ Tornado Cloud Solutions: ● AWS (EC2, S3, CloudFront, Route53) ● DigitalOcean ● RackSpace

    $33.33 /hr
    45 hours
    5.00
  6. alexander Merkulov

    alexander Merkulov Agency Contractor

    Asterisk/voip/a2billing/freepbx/kamailio expert

    Ukraine - Tests: 6 - Portfolio: 5

    My time is my value. So when you choosing me you can expect that job will be done in short terms and perfect. I not like to do something that not need be done, i prefer use developed components and solutions. That not mean i can't do development. I working with different programing tasks for last 26 years. yes, from 6 y.o. I live in it. So i prefer do something new&interesting; I can handle all tasks from linux administration/virtualization upto end-user web for voip. Only task i never do - graphical design part. That is not my field, better hire someone else for design. I have university degree, working with asterisk from start of this project. Have developing experience with freepbx/trixbox&a2billing. I am one of contributor of a2billing.org trunk. Also i can work as mysql/postgres DBA, database architect, has experience with following languages: Perl Python PHP C/C++ Javascript SQL Prolog/Lisp,Forth. In voip i can work with callweaver, asterisk, opensips, kamailio. Developed modules for freepbx, elastix, trixbox, a2billing.

    Associated with: UA Prime Agency

    $67.77 /hr
    545 hours
    4.97
  7. Sergey P.

    Sergey P.

    VoIP and Linux Engineer

    Russia - Tests: 5

    OS: linux (gentoo, debian, centos ...), FreeBSD over 10 years using/administration Lang: perl, lua, shell (java, ruby, erlang studying) VoIP: asterisk, freeswitch, gnugk, kamailio/ser (over 7 year administration) PBX: Si2000 (v.5), Definity administration (SS7, ISDN) DB: mysql, postgresql Sec: DMVPN, IPsec, OpenVPN Publish: LaTeX

    $30.00 /hr
    76 hours
    5.00
  8. Konstantin Palkin

    Konstantin Palkin

    Systems Administrator / Developer

    United States - Tests: 7 - Portfolio: 2

    I have a BS degree in IT Computer Networks and I am a System Administrator, Technical Support Specialist with more than 14 years of experience, planning and implementing computer systems and networks. I have in-depth knowledge of Linux Server Administration and IT Technical Management. I have strong experience with discussion, elaboration and implementation customer requirements as well as company's needs. Demonstrate by my adeptness in Web server (LAMP) deploying, configuration, optimization, and security protection as well as Bash/Python/PHP scripting development. In addition I have extensive knowledge of Optimization and Speeding up content delivery and implemented several fully worked systems with modern cache solutions. I have strong experience with maintaining web-sites, optimize MySQL databases, customize components and layouts and implement security measures.

    $40.00 /hr
    15 hours
    5.00
  9. Clifton Johnson

    Clifton Johnson

    Over 20 years of IT experience

    United States - Portfolio: 2

    I have over 20 years of computer support, administration and programming experience (both in the private sector as well as at major universities). When I was employed as the lead unix administrator for the College of Science (2000+ user accounts), I managed 14 core servers (providing e-mail, login, web, application, and backup services) to faculty, staff, and graduate students. I also provided customized support for many of the researchers. While working for Bike Friday, I was the sole computer person, responsible for multiple servers, desktops, printers and manufacturing terminals. I was also responsible for web development and in house database management/development using Postgres and Php. I have extensive experience with Drupal site management, including module development.

    $21.00 /hr
    125 hours
    4.80
  10. Robin J.

    Robin J.

    Server Administrator and Automation Expert Linux / Windows

    India - Tests: 2

    Approx 4 years of experience in the field of Server Administration of Linux/Unix/Solaris/Windows. Good experience in the following points: Full Server Installation and configuration with the latest patches Hardening server Server security Server optimization Live server migration Server monitoring Expertise areas: 1. Linux Server Distributions (RedHat, CentOS, Fedora, Ubuntu) 2. WebServers (Apache/Litespeed, Nginx, Tomcat, Jboss) 3. Hosting Control Panel (WHM/C-Panel, Direct Admin,ISPConfig, Plesk Panel) 4. Monitoring Tools (Nagios, Cacti, Mrtg, Prtg) 5.Server Security (Iptables, CSF, Rkhunter, Chkrootkits, SSHD, TCP Wrapper) 6. Database (MySql, Oracle) 7. Mail Server (SendMail, Exim Mail, Zimbra, QMail) 8. Virtualiation (Virtuozoo, Hyper-V, OpenVz, Xen) 9. Scripting (Bash Shell) 10. Other: DNS, DHCP NFS, FTP, Smabha, Telnet, Ldap, NIS

    $12.00 /hr
    152 hours
    4.96