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Last updated: October 1, 2015

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Andrei Volkov

Andrei Volkov Agency Contractor

Linux specialist (Sec/Opt/Dev, C/Perl/Python/PHP/BASH)

Belarus - Tests: 5 - Portfolio: 13

Important: ------------------- Enhanced shield of your Web application with mod_security! Should be always. It is task #1 after installation ANY web application! ------------------- About Me and more: ------------------- I have over 16 years of work experience with Linux systems. This is the list of software and technologies with which I deal. This list is not full and expands day by day. I always can find right decisions if I found some problems. And I am always interested in looking for mostly economical and productive solutions. Of course, Cpanel, WHM, Webmin, Plesk .... I know how are working these web-wrappers and I support their. I can will tune and to make the checking of these wrappers. But that more important !! I can work without this))) Directly use configuration files of services and etc etc. Usually, it is better way on dedicated servers. ) TCP, IPv4 , IPv6, IPX ... - WiFi, WEP, WPA, WPA2 ... - SElinux, Apparmor, Smack, Tomoyo ... - LAMP ( Apache, Nginx, PHP, Perl, Mysql, Mongo), REDMINE ... - Cpanel, Zpanel, ISP ... - MySQL clustering and replication DNS servers ... - SENDMAIL, EXIM, POSTFIX (POSTFIXADMIN,MYSQL,DOVECOT,POLICYD) ... - HPC system: Torque, Maui, Moab for HPC clusters, Infiniband, FC interconnect, iSCSI, SCST, DRBD, OFED, OPENMPI ... - OpenLDAP ... - VPN with OpenVPN, PPTP, StrongVPN ... - Nagios, Zabbix, Ganglia, OSSEC ... - SVN, CVS, GIT ... - KVM, Xen, OpenStack, Proxmox ... - NBD, RAID, LVM ... etc etc During these years I have been in a large number of tasks related to administration of network devices, as well as with simple and complex server systems. I manage servers for the HPC tasks and for network infrastructure of Internet and Intranet - DNS,DHCP,*FTP,HTTP(S),MAIL etc etc. The main goals - the monitoring of the performance and the security. I also implement tasks of data backup and troubleshooting, support for the users. I have comprehensive work skills with systems based on Debian, Redhat, CentOS, SLES, OpenSuse. I've got more than 8 years of experience in developing the different software with use of C, Perl, Python, Bash, HTML on system and user levels. For example, very important skill in developing and the modification of RPM packages (rpmbuild, rebuild, kernels), custom kernels and etc etc. ------------------- Often: ------------------- How the standart service for VPS's and VDS's projects and dedicated servers: IDS, IPS, the control of contents of log's files, the control of load of the cpu, the memory, the hard disks; the backups of the databases and the files; install or update software, consultations. Emergency call via sms to cell phone. ------------------- STOP Windows and U/K/buntu etc. TIPS WITHOUT PAYMENT: ------------------- 1. VERY OFFTEN: IF YOURS WP WAS HACKED 1. disable plugins 2. execute # diff -r dir1 dir2 3. repeat for plugins if you have last version of WP code: ~ 80% cases - problems: plugin low quality (look on author: from where and who is) ~ 15% cases - problems: theme low quality (look on author: from where and who is) ~ 5% 0day of WP also you need disable all shell function in php and enable suphp/suexec modes. STOP Windows and U/K/buntu etc. TIPS WITHOUT PAYMENT: ------------------- 1. I am getting a lot questions about reliability and quality distributives/clones Ubuntu. Results on practice - Ubuntu clones - worst for server. It is truth. If you $buntu guy, I can't help you right now. I only can recommend Debian way for server. =============== 3. Nginx of course is good program. For small/middle vps. But in serious projects - apache. Nginx will be suitable for frontend. It is only practice. Always for all web application should be mod_security module. Firewall of level of web application on 7 level of OSI. Each web application/site should be under own user in environment of vps or on dedicated servers. =============== 4. By topic Wordpress. For optimisation services of OS , namely system IO(type of disks or partitions) and DB(type of engines of tables), need to use empty installation (default variants). Most problems of work WP contains in itself - customized plugins or themes. For analyze pages need begin with such services as =============== Sunday - day of rest. Or in emergency case - payment with double rate. best regards, Andrei / PS: With love from USSR. ;-)

Associated with: UPWORK.LINK

100% Job Success
$16.00 /hr
1,023 hours

Valeriy Vilhovoy

Valeriy Vilhovoy

Network / Cisco / Linux Administrator / Cloud Expert / AWS / DevOps

Poland - Tests: 2 - Portfolio: 4

PROVIDES 24/7 SUPPORT IN REMOTE SERVER ADMINISTRATION, Having 7 Years of Experience in AWS / Linux / Server Administration with experience in ( EC2, S3, ELB, High Availability Architecture , EBS, Beanstalk, Security Groups, Route53, Cloud Front, (CDN) , RDS VPC, Cloud watch, Autoscalling etc Having 7 years of Experienced in Linux ( Red hat , Fedora, Cent OS , Ubuntu ), , Windows Server 2008 , Lampp Server Administration , Apache , IIS , Microsoft SQL Server (2005,2008) Administration , MySQL Server , DNS Server , SSL , Zimbra Collaboration Suite , Scalix , Axigen ,Open fire , Iptables , Linux Based Firewall , Subversion , Endian Firewall , VMWARE Work Station , VMWARE ESXI , Citrix Xen Server , Microsoft Hyper -V , PBX (Asterisk ,Sip exec) , Apache , LAMP , virtualization etc.. Networking skills: OSPF; RIP, STP, BGP, RSTP, TCP/IP, IPv6, NAT, MSTP, PAT, VLAN, Private vlan, ACL. VPN Servers: OpenVPN, PPP, PPTP, PPOE, Site-to-Site VPN IPSEC, L2TP. Network equipment: Cissco ASA, BDCOM OLT P3310-AC, Cisco 2950, 3550, 3650, 2911, Juniper, Allied Telesis, D-Link, TP-link, Ubiquiti Networks, Extreme, Motorola AP-6521, Monitoring and control: of wireless subscribers 500 Air Control 2 Billing Systems: Installation and configuration of servers ABillS billing.

$20.00 /hr
111 hours

Roman Voitenko

Roman Voitenko

linux/freebsd, high load solutions, scripting, amazon ec2

Sweden - Tests: 4 - Portfolio: 1

My experience as system administrator is mostly focus on Linux. Skills include deploying, migrating and managing Linux systems, development of high-load redundant clusters, automating operational tasks using puppet, perl, shell scripting with attention to documentation, standardization, procedures and policies. I’m a perfectionist in work and in my life.

$66.67 /hr
725 hours

Moztaba Ahmed

Moztaba Ahmed

Linux System Administrator | AWS Solution Architect | cPanel/Whm

Bangladesh - Tests: 4 - Portfolio: 1

I'm a Linux System Administrator for over 5+ years now. I am familiar with all kind of problems and solutions related to Linux servers. I can install, troubleshoot all kind of control panel's out there (Ex: cPanel, Kloxo, ISPCONFIG). I am working with WHM/cPanel for over 2 years now. I can troubleshoot, install, secure & monitor Linux servers with any kind of Control panel installed on it. You and I will be a great pair of professional workers to accomplish anything we want. So, what are you waiting for. Just get on with it and hire me. I assure you, you won't be disappointed. Thanks with regards

$20.00 /hr
2 hours

Mariel therese S.

Mariel therese S. Agency Contractor

Technical Consultant

Philippines - Tests: 11 - Portfolio: 2

Started out as a web developer, now a (certified) database and system administrator. I have over 3 years of experience with working, as a consultant, with companies from different industries (manufacturing, financial, telecommunications). Technologies I am familiar with include installation, configuration, and administration of Oracle Databases (with RAC, DataGuard, partitioning and other database-related products and features) and various Linux systems. Recently, I have started working with Oracle engineered systems as well. My development experience allows me to see creative ways of seeking solutions to various issues I encountered by me or my clients. This is something I have proven to be quite valuable in this trade. I am looking for opportunities that will expand my knowledge with the technologies I have been working with and in turn, improve current systems for you or your company. That being said, I amenable to looking into other systems/technologies I may not be well-versed with in order to complete client requirements properly.

Associated with: Mondex Professionals Agency, Streusel Inc.

100% Job Success
$25.00 /hr
535 hours

Alex Bosenko

Alex Bosenko

Asterisk VoIP Expert

Russia - Tests: 3

Extensive experience in VoIP architect/Asterisk/Elastix/Trixbox. Software development, system integration - Develop custom VOIP applications they fit to your business environment - OpenSips/Kamailio, Load Balancing, High Availability and Scalability solutions - Least Cost Routing, Rate and billing systems - IVR/Autoanswers/Auto Attendant Development/etc - Secure VoIP TLS/SRTP/ZRTP

$20.00 /hr
2 hours

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
533 hours

Dragos Crisan

Dragos Crisan

System Administrator

Romania - Tests: 6 - Portfolio: 1

I am a results-oriented person. I have fourteen years experience in managing computer networks, installation, configuration and administration of servers. I worked with several operating systems, both Linux and Microsoft. I have experience in configuring Active Directory, IIS and Routing and Remote Access. I also have experience in the installation and configuration of Linux mail servers, both sendmail and qmail. I have 2 years experience with postgresql sever

$10.00 /hr
0 hours

Saifur Rahman Khan

Saifur Rahman Khan Agency Contractor

Saifur, Your Solution for Data analyzing, IT Sec., Networking pentest

Bangladesh - Tests: 6 - Portfolio: 6

!!!!! 2500+ Hours Experience !!!! FEEL COMFORT WITH LONG TERM PROJECT !!!! To find a job where by dedication, hard work and the ability to acquire new skills. Seeking opportunities to utilize my skills in Data analyzing, Online Advertising, Networking, Security and Web researching. I am patient, pay attention to detail, work accurately and can took instruction very well, while displaying initiative. My ultimate target is to do quality job and build good relationship with employers. I have a great experience of Data transcribing and directory collection.I am a hard working contractor, very responsible to employers and very sincere about time and work. Have experience on the field of Online Advertising (DG/MediaMind, Adap TV), Networking, IT Security(Defense Intelligene, Canada & data edge ltd, Bangladesh), Web research, Word, Excel, SEO, Internet Marketing, Face Book, Administrative Works etc. Want to build a good career in Upwork.

Associated with: Faridpur IT Company Limited

100% Job Success
$5.56 /hr
2,732 hours