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docs/linux_zt_sdk.md

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+Docker + ZeroTier SDK
+====
+
+Welcome!
+
+Imagine a flat, encrypted, no-configuration LAN for all of your Docker containers. 
+
+This short tutorial will show you how to enable ZeroTier functionality for your Docker software container with little to no configuration. In this example we aim to build a Docker container with ZeroTier’s Network Container service bundled right in so that it’s effortless to hook any number of your services in the container up to your virtual network.
+
+**Step 1: Build the ZeroTier service binaries**
+
+From the ZeroTier source directory,  `make netcon` Optionally, if you'd like to see some debug output during execution, use `make netcon NETCON_DEBUG=1`
+
+**Step 2: Build your Docker image**
+
+`docker build --tag=redis_test .`
+
+The example dockerfile below incorperates a few important elements:
+ 
+1) The ZeroTier service binaries
+2) Whatever ZeroTier identity keys you plan on using (if you don't already have keys you wish to use, fret not! A new identity will be generated automatically).
+3) The service we've chosen to use. In this case, redis.
+```
+FROM fedora:23
+# Install apps
+RUN yum -y update
+RUN yum -y install redis-3.0.4-1.fc23.x86_64
+RUN yum clean all
+# Add ZT files
+RUN mkdir -p /var/lib/zerotier-one/networks.d
+ADD netcon_identity.public /var/lib/zerotier-one/identity.public
+ADD netcon_identity.secret /var/lib/zerotier-one/identity.secret
+ADD *.conf /var/lib/zerotier-one/networks.d/
+ADD *.conf /
+ADD *.name /
+EXPOSE 9993/udp 6379/udp
+# Install LWIP library used by service
+ADD liblwip.so /var/lib/zerotier-one/liblwip.so
+# Install syscall intercept library
+ADD libztintercept.so /
+RUN cp libztintercept.so lib/libztintercept.so
+RUN ln -sf /lib/libztintercept.so /lib/libztintercept
+ADD zerotier-cli /
+Add zerotier-netcon-service /
+# Install test scripts
+ADD netcon_entrypoint.sh /netcon_entrypoint.sh
+RUN chmod -v +x /netcon_entrypoint.sh
+# Start ZeroTier-One
+CMD ["./netcon_entrypoint.sh"]
+```
+
+**Step 3: Start your container**
+
+`docker run -d -it redis_test /bin/bash`
+
+**Step 4: From your container, set up environment variables**
+
+Set our application pre-load with `export LD_PRELOAD=./libztintercept.so`. This dynamically loads our intercept library into your application which allows us to re-direct its network calls to our virtual network.
+
+Tell the ZeroTier Network Containers service which network to connect to with `export ZT_NC_NETWORK=/var/lib/zerotier-one/nc_XXXXXXXXXXXXXXXX`.
+
+**Step 5: Run your new ZeroTier-enabled service**
+
+At this point, simply run your application as you normally would. It will be automatically intercepted and linked to the ZeroTier service (and hence your virtual networks!)
+
+`/usr/bin/redis-server --port 6379`
+
+***
+**Additional info**
+If you'd like to know the IP address your service can be reached at on this particular virtual network, use the following:
+`zerotier-cli -D/var/lib/zerotier-one/nc_XXXXXXXXXXXXXXXX listnetworks`