# Get rid of "postscreen_cache: unable to get exclusive lock" errors

Managed VPS plans offer a managed environment similar to our shared hosting accounts, but with increased resource availability. If you are outgrowing a shared hosting environment, but are not ready yet to make the leap to a dedicated server, you should consider a managed VPS. This plan is also a good option if you need certain customizations that are not provided with shared hosting plans, but you would still like A2 Hosting to handle configuration changes, software upgrades, and other system administration tasks.
•	Daily & Weekly Backup of VPS Data

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Expert Overview
Once you register your website's domain name, it's time to start picking the specs for your server. Web hosts typically offer multiple VPS plans that have varying amounts of email capability, RAM, storage, CPU power, domain hosting, and monthly data transfers. The plans typically include website builders that let you quickly create a face for your site without much—or even any—coding required. A solid web host should offer at least 4GB of RAM, 100GB of storage, and an ample volume of monthly data transfers. If you expect a significant amount of website growth, then you should look for a web host that has as many unlimited offerings as possible. For example, Hostwinds—the PCMag Editors' Choice for VPS hosting—offers unlimited email, domains, and monthly data transfers. Note, however, that as with all unlimited service offerings, you really need to read the fine print to make sure that what you mean by unlimited and what the hosting service means by it.

Every plan has some appealing configuration options. In particular, along with support for the usual Linux variants – CentOS, Ubuntu, Fedora, Debian – you can choose Windows Server 2008, 2012 or 2016 for only a $5 a month premium. That's very good value, and if you're more familiar with Windows than Linux, it could save you from lots of management hassles later on.
ScalaHosting allows you to have your own fully managed cloud VPS with a control panel and daily backups.
You’re paying more, so there SHOULD be a minimum uptime guarantee and better server speed. Look for a host that offers 99.5% at a very minimum, although ideally, I’d rather go with someone who offers 99.9%. Search through some reviews as there are many who have put this to the test. For example, any of WHSR’s many web host reviews include an uptime record as one of our key tests.

Eliran Ouzan:
VPS hosting is a great option for anyone who has outgrown the basic features of a shared plan. It’s perfect for small businesses that are steadily growing and gaining more traffic. You get more resources to support that growth and better control over how your site performs. Plus, you can easily adapt the hosting service to meet your needs as they change.

You also get the following benefits:
VPS hosting contains the best elements of shared hosting and dedicated hosting services. Like shared hosting, VPS hosting puts your website on a server that also has other sites running on it, except that there are fewer sites per server. The sites share the cost of running on the server, which results in a monthly or yearly charge that's less than the relatively high price tag of dedicated hosting.
Managing servers is time-consuming and technically demanding. It can be expensive to staff an entire team dedicated to maintaining hardware updates, monitoring security, and generally keeping things online. With this in mind, some of the leading hosts offer IT expertise to manage the infrastructure for you. It’ll cost a bit more but, more than likely, managed support will also save you a priceless number of headaches. InMotion Hosting’s service is top-of-the-line when it comes to managed VPS hosting.

Most SSD storage drives operate in RAID arrays in data centers including multiple copies of website files for backup purposes in case of hardware failure. SSD storage can also be used as Virtual RAM (VRAM) with much higher performance standards than HDD for caching PHP & MySQL database functions in active memory. Effective use of SSD & VRAM in web servers can save significantly money in corporate IT and has been developed by Twitter in their data centers. Generally, it would not be recommended to sign up for VPS plans implementing HDD storage over SSD options in 2017 for hosting.


Keep firmly in your mind the sort of assets that you require to serve your site(s) when seeking a host. Cost in a VPS is important, but not as key as you might think. VPS resource availability is scalable, so the cost that needs to be looked at is comparable cost from one host to the next. Also – as cPanel revised their pricing model recently, web hosting companies across the board will have to pass those costs on to users sooner or later. You will need to consider the cost of control panel when selecting a VPS plan. Companies like ScalaHosting has developed their own control panel to mitigate this issue – so their users would have little issues with the price hike.
VPS, on the other hand, is an isolated playground specifically for you. You will be able to install and use any professional software you need. It also provides more opportunities for caching the content. Imagine that you implement caching tools to provide your users with better experience and reduce the loading time of your website. Caching means that the part of requests to your website will be processed using RAM instead of a hard drive. Eventually, RAM will be filled with these requests. Since VPS deals offer more RAM then shared packages, you will get better performance using caching.
Now go to Virtualmin > Server Configuration > Manage SSL Certificate and select the Let's Encrypt tab. Select Domain names listed here and insert the server's hostname. Click Request Certificate and your free certificate should be installed. Four new buttons will appear to allow you to copy this certificate to Webmin, Usermin, Postfix and Dovecot - click each of them in turn. Your server now has free certificates installed, and they will update automatically every 2 months.
You can check your hostname under Webmin > Networking > Network Configuration > Hostname and DNS Client. Unfortunately, some hosting companies overwrite this information every time a VPS is rebooted - you may need to contact them to get it changed. Choose a fully-qualified subdomain that you own, such as "webserver.mydomain.com" or "mail.mydomain.com". Do NOT accept a generic name provided by the hosting company if you will be sending email from the server because spam filters will block it and you can't easily generate SSL certificates for it.
postscreen_dnsbl_threshold = 1
That’s really the biggest benefit to migrating from a shared to a virtual server: Your site can grow to receive more visitors without you having to eat the higher cost and hardware responsibility of a dedicated server. VPS users are rarely first-time site owners or folks seeking a personal email server. Typically, the people using a VPS are those whose sites or apps are receiving upward of 100,000 visitors a month.
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Expert Overview
Craig Timmins:

SSLStaplingCache "shmcb:logs/ssl_stapling(32768)"
VPS.net offers a chargable service for tasks that are additional to ordinary support requests. Customers can also purchase a managed service package which provides peace of mind via professional server management from the host. This in turn provides customers with a comprehensive SLA which goes beyond the SLA specified on other hosting services offered by the company.
Locations offered: 117 cities in 64 countries

- Top-Rated Support by HostAdvice, TrustPilot, Facebook Reviews
Shared hosting is not meant for websites that use large amounts of RAM. As your website grows and you add more and more content, you will start to see a decrease in your website’s load times. As soon as this happens, it’s an indication that you are maxing out your limits. Upgrading to a VPS will enable you to scale your website without having to worry about slow load times.

With cloud hosting, you don’t use a single server but rather a cluster that runs in the cloud. Each server in the cluster stores an up-to-date copy of your website. When one of the servers is too busy, the cluster automatically redirects the traffic to a less one. As a result, cloud hosting comes with no downtime, as there’s always a server in the cluster that can serve the requests of your website visitors.


Max Ostryzhko:


You’ll also Benefit from the Following Features:
The proftpd and BIND9 services are probably not necessary (SFTP and external nameservers are better) and can be disabled by going to Webmin > Bootup and Shutdown and clicking Stop Now then Delete. You can also disable the ftp port in Webmin > Networking > Firewalld. Do NOT disable DNS port 53 on either TCP or UDP because responses to outgoing queries could be blocked.

Do you remember those times when you were living on a college campus with very noisy roommates? Or maybe they were super quiet and you enjoyed every day? The point is, it was a gamble - you never knew whom you ended up with. This is pretty much the same as having shared hosting account - you haven’t the faintest idea who is your roommate on a server. The analogy may sound funny but if someone on a shared server becomes a distributed denial of service (DDoS) attack target or get blocked for mass mailing, other accounts on the server will be affected as well. Also, if a shared account abuses server resources, the whole server will be impacted. Using a VPS is like owning a house with a 9 foot privacy fence. You won’t be bothered no matter what your neighbors are doing.
For years, Minecraft has inspired creativity in players. The size of the Minecraft world is bigger than the planet Earth. It is a ridiculously large playground where you can build something on your own or collaborate with other players. If you prefer multiplayer, you can set your own server up and create the world for you and your friends. Running your own server gives your certain power: you can choose a game mode, invite and ban players, change their spawn points, etc. There are a number of advantages you will get if choose to set a Minecraft server on a VPS instead of your home PC:
Let’s break hosting types down using a simple analogy. Shared hosting is like living in an apartment; it’s cheap and can come furnished with everything you need to move in. The tradeoff is sharing facilities with many other people (sharing resources with the other accounts on the same server), and if you throw a massive party (have lots of traffic), building management will want to talk to you.
Michael Lavnduski:
We’ve recommended InMotion’s Business Hosting Plans for many years now. However, their VPS Hosting plans take things to another level. First of all, with InMotion Hosting’s VPS you get real-time redundancy—meaning, if there is an issue with your server, your website will be available almost instantly on another server in the cluster. This high availability feature is powered by a cloud infrastructure. The combination of VPS and cloud hosting benefits make InMotion Hosting one of our top picks. But, you actually get much more with their VPS Hosting plans.
VPS ensures that your website continues to run smoothly, regardless of what is happening elsewhere on the server. It also protects your data from multiple sites, giving you a secure piece of virtual real estate to build a website on.

An impressive all-around performer, this is a hosting provider with great care for the little details and outstanding support team. While the company doesn’t have the most affordable VPS plans out there, it delivers outstanding value with superior quality of service. The stellar WordPress services are just the cherry on top of lightning fast servers with unique architecture and rock-solid security.
Whatever your VPS hosting needs, you can create a configuration for it at InterServer. InterServer is one of the few hosting companies that offer both Linux (multiple flavors) and Windows VPS servers. They also offer the option of several different virtualization platforms such as OpenVZ, KVM, or cloud. Depending on your configuration, you can choose between a fully managed and a full control (for you) server.
Be careful, though – there are some common traps many people fall into. Firstly, the promotional prices are only on offer for a month, after which you’re paying between $49.99 and $299.99/month on any of its five plans. Secondly, the 30 day, money-back guarantee is only valid for those who subscribe for a year or longer. Everyone else only has 48 hours to claim a refund.
Expert Overview
VMware is also extremely popular in enterprise IT for virtualization, with the ability to run any Linux distribution as well as Windows servers in private, public, and hybrid cloud orchestrations. Unmanaged VPS plans can be installed with Ubuntu, RHEL, Slackware, Debian, Rancher OS, BSD, CentOS, CloudLinux, Windows, etc. as required by the user preferences or project requirements.


You can check your hostname under Webmin > Networking > Network Configuration > Hostname and DNS Client. Unfortunately, some hosting companies overwrite this information every time a VPS is rebooted - you may need to contact them to get it changed. Choose a fully-qualified subdomain that you own, such as "webserver.mydomain.com" or "mail.mydomain.com". Do NOT accept a generic name provided by the hosting company if you will be sending email from the server because spam filters will block it and you can't easily generate SSL certificates for it.


Liquid Web claims to have the fastest managed VPS hosting on the planet. That might be true. Their VPS hosting plans are a little bit more expensive than you will find with other hosts. However, their base plan comes with 2 vCPUs, 40GB SSD disk space, 10TB of bandwidth, and the choice of cPanel or Plesk Onyx. Their base plan is only for Linux-based hosting as well.
Providers like Bluehost and iPage offer instant deployment, so you can quickly get on to business. The InMotion Hosting team offers Launch Assist — two hours of assistance from experienced SysAdmins — to customers who sign up for 12 months or longer. Our team tested all the top VPS hosts and found the signup times to take around six or seven minutes, so getting started is — virtually — a snap.

Other powerful features included in InterServer VPS hosting plans are high performance SSD storage, easy to use VPS control panel, instant provisioning, and 99.9% uptime guarantee. They also provide 100s of free scripts to make it easy to install the most popular applications on your VPS server.
Keep firmly in your mind the sort of assets that you require to serve your site(s) when seeking a host. Cost in a VPS is important, but not as key as you might think. VPS resource availability is scalable, so the cost that needs to be looked at is comparable cost from one host to the next. Also – as cPanel revised their pricing model recently, web hosting companies across the board will have to pass those costs on to users sooner or later. You will need to consider the cost of control panel when selecting a VPS plan. Companies like ScalaHosting has developed their own control panel to mitigate this issue – so their users would have little issues with the price hike.
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SupremeVPS is back with some exclusive offers for the community. This time, they are focusing on their SSD Linux VPS offers.
Be careful, though – there are some common traps many people fall into. Firstly, the promotional prices are only on offer for a month, after which you’re paying between $49.99 and $299.99/month on any of its five plans. Secondly, the 30 day, money-back guarantee is only valid for those who subscribe for a year or longer. Everyone else only has 48 hours to claim a refund.
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