Linux System Administration Jobs

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Hourly - Entry Level ($) - Est. Time: 1 to 3 months, 10-30 hrs/week - Posted
We are looking for a Linux administrator who will be able to Fine tune performance and ensure high availability of infrastructure Design and develop infrastructure monitoring and reporting tools Develop and maintain configuration management solutions Create tools to help teams make the most out of the available infrastructure Skills Experience with Linux servers in cloud environments Familiarity with the fundamentals of Linux scripting languages Experience installing, configuring, and maintaining services such as Apache, MySQL, etc.
Skills: Linux System Administration
Fixed-Price - Intermediate ($$) - Est. Budget: $60 - Posted
Looking for a Zimbra guru to close some security vulnerabilities,: *SSL Server Allows Anonymous Authentication Vulnerability *OpenSSL Weak RSA Key Exchange Vulnerability *OpenSSL Diffie­Hellman Weak Encryption Vulnerability (Logjam) *OpenSSL Multiple Vulnerabilities (OpenSSL Security Advisory 20150319) *SSL Server Supports Weak Encryption Vulnerability *CONNECT Method Allowed in HTTP Server Or HTTP Proxy Server Vulnerability *Unauthenticated/Open Web Proxy Detected *SSL/TLS use of weak RC4 cipher *SSLv3.0/TLSv1.0 Protocol Weak CBC Mode Server Side Vulnerability (BEAST) *SSL/TLS use of weak RC4 cipher *Web Server Uses Plain­Text Form Based Authentication *SSL/TLS use of weak RC4 cipher *SSLv3 Padding Oracle Attack Information Disclosure Vulnerability (POODLE) *OpenSSL Multiple Vulnerabilities (OpenSSL Security Advisory 20150108) *OpenSSL Multiple Denial of Service Vulnerabilities (secadv_20150611) *Apache Tomcat Multiple Vulnerabilities I can provide report, with suggested fixes.. Cheers Dave
Skills: Linux System Administration CentOS Zimbra Administration
Fixed-Price - Intermediate ($$) - Est. Budget: $130 - Posted
We recently have been unfortunate to experience an accidental "CHOWN /" event on our centos7 server. We have recovered and have working all production facing pages (php, apache, client side session/php session and mysql) all up and working. We still have file permission issues on a number of packages causing a few issues (that we can see): * phpmyadmin not working * security flaws due to permission mismatch This job is to return the server to a usable state, and then quote for ongoing SYS Admin work (ie. this has brought this problem and dependancy to the FORE, we need to move to a dedicated person to help with SYS admin). ON hand for any questions - between 7am and 11pm AEST preferred for work, so I can engage via chat etc when needed.
Skills: Linux System Administration System Administration
Fixed-Price - Intermediate ($$) - Est. Budget: $20 - Posted
Hello, I have bought a video streaming script where i need the script to be configured with Nginx. I will be having Cpanel installed on the server. I need Help in installing Nginx with Cpanel and server should be running with both 80 port on Nginx as reverse proxy and another port for Apache My streaming script should be configured with Nginx and i need Ftp module ( uploading files via ftp and post it on website) I need documentation for this project. I will pay the full amount only after job is finished Thanks
Skills: Linux System Administration CentOS FTP Nginx
Fixed-Price - Intermediate ($$) - Est. Budget: $21,000 - Posted
【BACKGROUND INTRODUCTION】 Have you ever thought about "cracking" the visa/ticket application system using your technique? Do you see a huge and profitable market in it? Many people in developing countries chase after popular visas in developed countries. However, places for some are limited. Take Silver Fern Visa in NZ, for example -- only 300 places each year. Such visas are great opportunities for those who want to migrate to another country. They snap up sought-after visas once the applications are opened. The ones who do faster in the applications win at last. That's why there is a great opportunity in it. You must apply for a place on Embassy's website, and machine is no doubt faster than applicants themselves. What if you develop a software to help them with the applications? What if a software takes care of everything by automatically filling in information, proceed and submit the applications? You can earn a lot just by selling the places you grab. People are willing to pay, as long as you secure them a place under the quota. Some companies are already doing this job. The price for one place varies from 800 USD to 3000 USD. A lucrative business, isn't it? Imagnie that you have 100 customers... 【WHO WE ARE, WHAT WE WANT】 We are a startup based in Hong Kong. We have a great marketing and sales team. We are looking for a partner who can develop a program, e.g. a software, to help our customers grab places for these visas! 【REQUIREMENT】 1. Proficiency in coding, software developing and network operation. 2. Fast learner. 3. English literacy. Good communication skills. 4. Sense of responsibility. 【PAY】 AT LEAST 7000 USD for the first term (Australia visa system. September 2016, 20 customers). We expect three terms until Feb 2017. This is a long term cooperation -- the more systems you "crack", the more you earn. You can organize your own tech team, if necessary. 【HOW TO APPLY】 Please apply through Upwork. Tell us why you are a good candidate.
Skills: Linux System Administration Internet Security Network Programming Network Security
Hourly - Intermediate ($$) - Est. Time: Less than 1 week, Less than 10 hrs/week - Posted
Maybe the title isn’t the best fit to describe the problem, but is the closest to reality. I have an CentOS 7 server ( let’s call it SSD1), running Drupal apps on top of Docker. 3 weeks after install, I have noticed that drupal is slower, at postgresql level ( via drupal devel query log). Even importing the same image Docker to a SATA server ( let’s call it SATA2), that is suppose to be slower, perform better that the initial SSD server. So, the problem isn’t anymore about Docker. In order to further isolate the problem, I have installed vanilla drupal directly on 3 bare metal servers. ( SSD1, SATA2, SSD3) Initially, I have tested with Vanilla Drupal 7 Devel query log, but, in order to avoid false positive, I have installed also Vanilla Drupal 8 which comes with WebProfiler from Symfony. The benchmark sites are installed on Postgresql and MariaDB also, so the performance issue isn’t specific to a certain database engine. All the results from 6 different Drupal 8 instances are the same ( SSD1 query logs are twice slower comparing to SATA2 and SSD3) Drupal connects to database via PDO. In order to avoid false positive due to this layer, I have investigated also the slow query logs for Postgresql, that confirms SSD1 being twice slower. BTW, I have the initial logs after SSD1 install, that confirms that SSD1 used to be fast. On the other hand, the disks are in good health, they are monitored with Smartmontools, all tests ( short and extended looking good). Now comes the strange part. I ran pgbench, benchmark test on PostgreSQL, at database level. SSD1, that is supposed to be slower, has 3315 transactions per second, comparing to average 2000 tps for SSD3 and SATA2. This was so confusing in the first place, but a possible explanation is that SSD1 2X http://www.cpubenchmark.net/cpu.php?cpu=Intel+Xeon+E5-2640+v3+%40+2.60GHz , comparing to SSD3 single http://www.cpubenchmark.net/cpu.php?cpu=Intel+Xeon+D-1540+%40+2.00GHz So, the task isn’t about a production database with performance degradation over time, but is about Vanilla drupal installs showing server slower performance, comparing to initial setup. Important: This task isn’t about tuning Mysql/Postgres, because the same my.cnf/postgres.conf files are used on different servers. Rather is about SysAdmin/Performance Engineer, at OS level. Warning: This is an advanced task, please do not apply unless you are familiar with described issues above. Working workflow via TeamViewer, can’t provide direct access to production servers. Communication via Skype with voice. Being a complicated task, communication is essential, chat only is excluded. Thank you! P.S. Further details bellow: -Software testing versions: Apache/2.4.6 (CentOS) MariaDB-server-10.1.16-1.el7.centos.x86_64 Postgresql95-server-9.5.3 php56u-5.6.23-1.ius.centos7.x86_64 -Chrome devel loading time has no difference for Vanilla installations of all servers, but for complex Drupal app the difference is visible. -Trying reverse engineering ( what changed since initial install) Disabling Selinux, iptables, reverting network to normal Ethernet ( was change to bridge) didn’t help. -Testing bonnie++, fortunately I have the initial results and the actual results. Block IO seems to be better comparing to initial , but latency seq read and delete seems to be worst (more that double now). -Write cache is off according with recommendation https://www.postgresql.org/docs/9.5/static/wal-reliability.html -Fstrim the ssd daily on cron. UPDATE: Comparing https://wordpress.org/plugins/query-monitor/ on SSD 1 and SATA2, I get better results on SSD1. This means that the issue is a Drupal 7/8 application level. Maybe at the PDO level, since Wordpress connects directly to database, without PDO layer. Testing with php56u, php55u, rhphp56 still shows slow results on SSD1. Only with stock php 5.3 SSD1 works fast with Drupal, but is not an acceptable solution to downgrade.
Skills: Linux System Administration CentOS MySQL Administration Performance testing