Redhat Administration Jobs

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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 , comparing to SSD3 single 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 -Fstrim the ssd daily on cron. UPDATE: Comparing 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: Red Hat Administration CentOS Linux System Administration MySQL Administration
Hourly - Expert ($$$) - Est. Time: More than 6 months, Less than 10 hrs/week - Posted
1st, a Word about us: We are - a not-for-profit Social Networking based Search engine. We have close to 2-Million members so we generate lots of emails on Daily basis to inform members based on their interest level. More about us here: We are looking for a really expert Linux Security Admin to help us with Administering our servers. BUT To start with, and this is VERY IMPORTANT: we have a specific task that we need you take care off. This task is to find and address, according to Spamhaus: "a spam sending trojan, malicious link or some other form of botnet" that our server is supposedly infected with according to Spamhaus. This is our main server with ip: A key Term of this Job is that its payment will be a Hybrid of Fixed and Hourly. With the Payment for this 1st Job being made only after Spamhaus confirms that this so called "spam sending trojan, malicious link or some other form of botnet", does not exist on our server anymore, which confirmation can take them a few days to make. So payment for this Job will be at your Hourly rate with a maximum of $250.00, but with bonuses if you work the Job quickly. With the bonuses being as such: 1- If work is finished in 2 Hours or less, then your Hourly rate + bonus of $75 2- If work is finished in 3 Hours or less, then your Hourly rate + bonus of $50 3- If work is finished in 4 Hours or less, then your Hourly rate + bonus of $25 And again with the Max fee upon Spamhaus verifying problem is fixed of $250.00 Example: your Hourly rate is $35 and you finish this work in 3 Hours. Then for this we will pay you your Hourly rate total of $35 * 3 plus bonus of $50 = total of $155 We have this Hybrid payment system for this 1st Job, because we have had so called Linux Admins contacts us before whom actually did not know what they were doing and wasted our time for Hours probing through our Server. We want to avoid such wasting of our time and yours. So that is why we are making the payment for this 1st Job to be based on successful result and speed of getting the Job done so that then we can see about your expertise for future Jobs. So if you do a great Job doing this 1st Task, we will then have you as our long term out-sourced Linux Admin, where we will pay you on Hourly basis. Bottom line: by doing this 1st Job successfully, and quick, you will tell us how good you really are as a Linux Admin, which will then result in us choosing you as our regular GoTo Linux Admin for future issues. Other BASIC requirements for this Job that you MUST meet are: 1- Your English read & write skills are good, 2- You have a good Headset and good Internet connection, since we will be meeting via Skype via Voice to get work done. 3- You have a working (paid version) of TeamViewer, since you will be accessing our server via TeamViewer via Putty on my desktop Details about our setup: 1- Our services are hosted on multiple Dedicated servers running LAMP. With the Linux being RedHat Enterprise on our main server, which according to Spamhaus is infected with the spam sending Trojan, etc. 2- We do not run plesk, or cpanel but manage our server via Putty. 3- Our email server is Qmail on main server. Please only contact us, if you meet the above Terms and the above BASIC Requirements for communication. Thank you. Dean Ansari Director:
Skills: Red Hat Administration Antispam and Antivirus Email Deliverability Firewall
Fixed-Price - Entry Level ($) - Est. Budget: $100 - Posted
Hi We are looking for a part time Linux server administrator. The ideal person will work with our team on on-going basis and help us manage, maintain our linux servers and managing the web servers You should have working experience with the following: - Advanced MySQL, Apache, Ngix, FastCGI configurations in Linux - Installation of LInux and its associated libraries and LAMP stack software in fresh linux install - Expert knowledge of different Web Hosting panels - Optimise servers when needed - Identify and suggest the right architecture/structure for any project with effective security permissions If you have any questions, please feel free to contact. Regards, NCPL Inc
Skills: Red Hat Administration LAMP Administration Linux System Administration MySQL Administration
Hourly - Expert ($$$) - Est. Time: More than 6 months, Less than 10 hrs/week - Posted
Roles & Responsibilities: - System installation, configuration, troubleshooting, performance analysis, tuning, upgrading, patch maintenance, license management, system backup administration, user account/environment administration, implementing and maintaining system security postures, fiber attached storage partitioning and presentations, documentation - Assist with hardware/software installations - Follow standard processes, plan effectively to complete tasks on schedule, and clearly document processes and results - Participate in a rotating 24x7 on-call operational support role Basic Qualifications: - Bachelor’s Degree in Information Technology, Management Information Systems, Information Systems or another relevant technical degree. An equivalent 4 years of experience may be accepted in lieu of a degree. - Self-motivated, have an understanding of RedHat Enterprise Linux (RHEL) and High Performance (HP) Linux operating systems, RHEL HA (high availability) Cluster management, RedHat Satellite Server (RHSS), RedHat Enterprise Virtualization (RHEV), HP and Dell Blade server chassis management. - Understanding of networking/zoning to include VLAN/VSAN setup, RHEL and SELINUX security lockdown and configuration, and strong Storage Area Network (SAN) administration skills. Preferred Qualifications: - One of the following certifications: A+, Network+, Linux+, Security+, CCNA, or MCDST.
Skills: Red Hat Administration Linux System Administration Red Hat Certified Engineer (RHCE) Red Hat Enterprise Linux (RHEL)