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% ----------------------------
\subsubsection{How to isolate Applications}
\begin{frame}[fragile]
\frametitle{How to isolate Applications}
\begin{itemize}
\item System Information via Kernel API
\begin{itemize}
\item Syscalls
\item PseudoFS (e.g. /proc and /sys)
\item Filesystem tree
\item Network Infrastructure (interfaces, components)
\end{itemize}
\item Namespaces
\begin{itemize}
\item Reduction of System Scope
\item System View Virtualization
\end{itemize}
\item Controlgroup
\begin{itemize}
\item Partitioning of System Resources (CPU time, Memory, etc.)
\end{itemize}
\item Container
\begin{itemize}
\item Configuration Tools
\item Use Namespaces and Controlgroups
\item Application in a Box
\end{itemize}
\end{itemize}
\end{frame}
% ----------------------------
\subsubsection{Namespaces}
\begin{frame}[fragile]
\frametitle{Namespaces}
\begin{itemize}
\item Mount: \\
Provide different filesystem
\item PID: \\
Provide new Process-ID scope
\item IPC: \\
Provide isolated inter process communication entities
\item Network: \\
Provide isolated networking environment
\item User: \\
Provide different User/UID mapping
\item UTS: \\
Provide different hostname
\end{itemize}
\end{frame}
% ----------------------------
\subsubsection{Container}
% ----------------------------
\begin{frame}[fragile]
\frametitle{Containers}
\begin{itemize}
\item Application Isolation
\item Lightweight Virtualisation
\item Based on cgroups and namespaces
\item Easy namespace configuration and management
\item Projects:
\begin{itemize}
\item Docker
\item Linux-VServer
\item OpenVZ
\item Linux Container (LXC)
\item \dots
\end{itemize}
\end{itemize}
\end{frame}
% ----------------------------
\subsubsection{LXC Handling}
% ----------------------------
\begin{frame}[fragile]
\frametitle{Linux Containers (LXC)}
\begin{beamerboxesrounded}[shadow=true]{Start/Stop container:}
\begin{scriptsize}
\begin{verbatim}
# Start: Better for single commands
lxc-execute -n cont_name [-f config] /bin/bash
# Start: Better for container systems
lxc-start -n cont_name [-f config]
# Stop container
lxc-stop -n foo
\end{verbatim}
\end{scriptsize}
\end{beamerboxesrounded}
\begin{beamerboxesrounded}[shadow=true]{Control container:}
\begin{scriptsize}
\begin{verbatim}
# Pause/resume container (controlling group of processes)
lxc-freeze -n cont_name
lxc-unfreeze -n cont_name
# Monitor container states
lxc-monitor -n cont_name
# Attach to container console
lxc-console -n cont_name
\end{verbatim}
\end{scriptsize}
\end{beamerboxesrounded}
\end{frame}
% ----------------------------
\begin{frame}[fragile]
\frametitle{Linux Container (LXC): Configuration I}
\begin{beamerboxesrounded}[shadow=true]{Networking example:}
\begin{scriptsize}
\begin{verbatim}
#
# new hostname for container
#
lxc.utsname = myhostname
#
# Network vistualization
# - private segment in container
# - connected via br0 to device network
#
lxc.network.type = veth
lxc.network.flags = up
lxc.network.link = br0
lxc.network.name = eth0
lxc.network.hwaddr = 4a:49:43:49:79:bf
lxc.network.ipv4 = 10.2.3.5/24 10.2.3.255
\end{verbatim}
\end{scriptsize}
\end{beamerboxesrounded}
\end{frame}
% ----------------------------
\begin{frame}[fragile]
\frametitle{Linux Container (LXC): Configuration II}
\begin{beamerboxesrounded}[shadow=true]{Controlgroup example:}
\begin{scriptsize}
\begin{verbatim}
#
# new hostname for container
#
lxc.utsname = myhostname
#
# schedule container processes only on CPU 3 and 4
#
lxc.cgroup.cpuset.cpus = 3,4
#
# Deny access to device nodes other than
# - /dev/null (c, 1, 3)
# - /dev/urandom (c, 1, 3)
# - /dev/sda5 (b, 8, 5)
#
lxc.cgroup.devices.deny = a
lxc.cgroup.devices.allow = c 1:3 rw
lxc.cgroup.devices.allow = c 1:9 ro
lxc.cgroup.devices.allow = b 8:5 rw
\end{verbatim}
\end{scriptsize}
\end{beamerboxesrounded}
\end{frame}
% ----------------------------
\subsubsection{Summary}
% ----------------------------
\begin{frame}[fragile]
\frametitle{Container: Summary}
\begin{itemize}
\item Lightweight Virtualization
\item Isolation of Applications
\item Hide System Resources/Configuration
\item Common:
\begin{itemize}
\item Shared Kernel
\end{itemize}
\item Solution:
\begin{itemize}
\item Viewability between Applications
\item Sandbox (in combination with MAC)
\end{itemize}
\end{itemize}
\end{frame}
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