SECURITY WARNING
Before installing Docker and containers with services on your Linux system, make sure to read and understand the risks as mentioned on this Docker and iptables page. Especially, Docker will make all your containers visible to the entire world through your Internet connection. This is great if you want to indeed share that service with the rest of the world, it's very dangerous if you are working on that container service since it could have security issues that need patching and such. Docker documents a way to prevent that behavior by adding the following rule to your firewall:
iptables -I DOCKER-USER -i eth0 ! -s 192.168.1.0/24 -j DROP
This means that unless the IP address matches 192.168.1.0/24, the access is refused. The `eth0` interface name should be replaced with the interface name you use as the external ethernet connection. During development, you should always have such a rule.
That has not worked at all for me because my local network includes many other computers on my LAN and this rule blocks them all. So really not a useful idea.
Instead, I created my own entries based on some other characteristics. That includes the following lines in my firewall file:
*filter :DOCKER-USER - [0:0] -A DOCKER-USER -j early_forward -A DOCKER-USER -i eno1 -p tcp -m conntrack --ctorigdstport 80 --ctdir ORIGINAL -j DROP -A DOCKER-USER -i eno1 -p tcp -m conntrack --ctorigdstport 8080 --ctdir ORIGINAL -j DROP -A DOCKER-USER -i eno1 -p tcp -m conntrack --ctorigdstport 8081 --ctdir ORIGINAL -j DROP
My early_forward allows my LAN to continue to work. These are my firewall rules that allow my LAN computers to have their traffic forwarded as expected.
Then I have three rules that block port 80, 8080, and 8081 from Docker.
Docker will add new rules that will appear after (albeit not within the DOCKER-USER list) and will open ports for whatever necessary service you install in your Dockers.
Note that the only ports you have to block are ports that Docker will share and that you have otherwise open on your main server. If Docker opens port 5000 and your firewall does not allow connections to port 5000 from the outside, then you're already safe. On my end I have Apache running so as a result I block quite usual HTTP ports from Docker.
As we are helping various customers, we encounter new technologies.
In the old days, we used chroot to create a separate environment where you could have your own installation and prevent the software from within that environment access to everything on your computer. This is particularly useful for publicly facing services liek Apache, Bind, etc.
Once in a while someone will ask me which book is best to start learning programming. The fact is that I do not know because I'm already an advanced programmer and it's rather difficult for me to get back to the basics (it feels like a waste of my time, sorry...)
That being said, at Made to Order Software, we've mainly been a C++ shop. We also do a lot of C, PHP, JavaScript and touch many other languages as required by the tasks we perform (bash, cmake, perl, C#, Java, etc.)
That being said, I wanted to underline some of the best C++ books available today. Especially, in the last ...
The protection tag is totally useless. The SWF format is an open format, otherwise how would you have so many players and tools to work with SWF movies? Thus, you can pretend to protect your movies, but anyone with a simple binary editor can transform the tag and make it another which has no such effect. Also, swf_dump and some other tools (such as flasm) can read your movie anyway.
For the sake of defining what you have in each tag, there are the protection tags fully described.
According to Macromedia, you can find some free implementation of the MD5 algorithm by Poul-Henning Kamp in ...
The file header is found at the very beginning of the file. It should be used to determine whether a file is an SWF file or not. Also, it contains information about the frame size, the speed at which is should be played and the version (determining the tags and actions possibly used in the file).
The f_magic[3] array is defined as the characters: 'FWS' (it is going backward probably because it was supposed to be read in a little endian as a long word). A movie can be compressed when the version is set to 6 or more. In this case, the magic characters are: 'CWS'.
The f_version ...
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At Made to Order Software we think that using Open Source software is an incredible leverage for our customers. Plain and simple: if the software is free, you do not need to pay for it. You only need to pay us for installing the software and training you on how to use it.
We currently offer three solutions: Compiere ERP & CRM, SugarCRM and X-Tuple ERP.
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Here you will find a few of the software solutions that have been made possible by Made to Order Software Corporation. Feel free to contact us for more information.
Made to Order Software created Snap! Websites, a CMS system, which allows customers to create their own websites, hosted on our servers.
The new version of Snap! is actually Open Source. You can find more information about Snap! Websites Open Source on the Snap! Website a C++ CMS website.
A few customers using our old Snap! offer include:
Made to Order Software Corporation offers software consulting, analysis, and development services at any stage of a project. Our analysts can provide you well-defined and thorough user and developer documentation for your project in a timely manner. We can determine the skill set necessary to accomplish the goals of the project, and maximize the number of workers on the project to shorten the development period.
From simple applications to complex e-Business solutions through realtime software and complex database systems, our people work at your convenience—in your office or ours.
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Made to Order Software Corporation specializes in corporate consulting, analysis and development services, as well as cutting-edge professional developer tools, libraries, training, and support. Our team of passionate developers are dedicated to uncovering your perfect software solution to analyze, enhance, or improve your critical computer systems—large or small.