Kitsune：一個高效通用的動態軟件升級的C語言框架

這個框架保證不關閉程序連接和改變狀態的情況下進行軟件更新，并且沒有額外的性能代價。已在Snort, Tor, Redis, Memcached, Icecast和vsftpd等多個開源軟件下進行了驗證。一般升級是雙進程模式，一個單獨更新進程重啟主程，這個是自身保存堆棧和連接狀態進行升級。

Getting Started

1. Build the Kitsune runtime and compiler/transformation generator:

(in Kitsune root directory) make

1. Build tests in the test/* directories. Most of these tests manually initiate an update by calling kitsune_signal_update() rather than having the user manually initiating the update.

2. Manually initiating an update normally works as follows:

Starting the initial version: (kitsune root)/bin/driver (version 0).so (args)

To update that process, run: (kitsune root)/bin/doupd (vN PID) (version N+1).so

Currently, the runtime prints the pid of the running process to stdout, which can be used in the call to doupd. (Note that multiple calls to doupd may be needed for programs that fork, like vsftpd.)

If Kitsune was built for benchmarking, then a benchmarking result filename is expected by driver between the shared library and its arguments. [We plan to streamline this later.]

1. Building and updating redis (as an example):

(build kitsune with threading)

cd examples/redis make

• builds versions of redis from 2.0.0 -> 2.0.4

../../bin/driver redis-2.0.0/redis-server.so

• starts the redis server under kitsune

(in another terminal) ../../bin/doupd PID redis-2.0.1/redis-server.so

• you can get PID from the original terminal or just use pidof driver in place of PID in this line (assuming you aren't running other things under Kitsune simultaneously)

When a program is updated with Kitsune, it generates a log file that can be found in /tmp/ekiden/PROG.PID (where PROG is the program name and PID is its pid).

1. Learning Kitsune: currently the tests/ are the best way to see how the kitsune tools work.

Overview of the Kitsune Repository

src/

• contains the Kitsune runtime source code

tools/

• contains the Kitsune compiler and transformation generator

tools/ocaml-src/

• Kitsune specific code

tools/ocaml-src/cil

• Kitsune code linked with cil for compilation

tools/ocaml-src/tools

• xfgen-related code

tools/ocaml-src/common

• code shared between the compiler and xfgen

bin/

• contains the externally used Kitsune header files and the compiled library

tests/

• a variety of tests ensuring correct behavior in the runtime library and compilation tools. These tests provide a good way to see how the parts of the system work together, and the compilation process for updating.</pre>
  

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