安装onos

SDN的特征

集中控制：集中控制使得全局优化成为可能，比如流量工程、负载均衡。集中控制使得整个网络可以当作一台设备进行维护，设备零配置即插即用，大大降低运维成本。

开放接口：应用和网络的无缝集成，应用告诉网络如何运行才能更好地满足应用的需求，比如业务的带宽、时延需求，计费对路由的影响等。用户可以自行开发网络新功能，加快新功能面世周期。理论上NOS和转发硬件的开放标准接口使得硬件完全PC化。

网络虚拟化：逻辑网络和物理网络的分离，逻辑网络可以根据业务需要配置、迁移，不受物理位置的限制。多租户支持，每个租户可以自行定义带宽需求和私有编址。

SDN关键技术体系：

ODL介绍

SDN南向接口

SDN南向接口的关键技术是转发面开放协议，该协议允许网络控制器控制交换机的配置以及相关转发行为。

Openflow是ONF定义的一个转发面控制协议，它将转发面抽象为一个由多级流表组成的转发模型，网络控制器通过Openflow协议下发Openflow流表到具体交换机，从而定义、控制交换机的具体行为。

OpenFlow是一整套软件应用程序接口，OpenFlow 控制器可以通过规范与支持OpenFlow 交换机沟通配置信息，决定数据转发平面的转发表，控制器与交换机间通过SSL 加密传输。

OF-CONFIG （OpenFlow配置和管理协议）由ONF控制和管理工作组制定和维护，是OpenFlow协议的同伴协议，是在包含OpenFlow交换机的运营环境下，除OpenFlow协议之外的接口配置和管理协议规范，目前采用NETCONF协议进行传输。

Openflow以及OF-Config提供了灵活、开放的手段，但是也有许多尚待改进的地方：
1.现有转发面硬件芯片无法在所有Openflow流表中支持协议中定义的匹配字段，导致Openflow协议灵活性大打折扣，也为网络控制器控制异构Openflow交换机增加了难度；
2.Openflow协议中仅仅支持了部分现有网络封包格式，后续对于协议的扩展也会存在类似标准化周期过长的问题。

SDN北向接口

SDN控制层将网络能力封装为开放的REST API，供上层业务调用。

ONF当前只定义了OpenFlow作为南向API，而回避了北向API标准化问题，因此不同的控制器具备有不同的北向API集合。

安装jdk

在jdk官网下载jdk

http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

 mkdir /usr/lib/jvm
 tar -xzvf  jdk-8u251-linux-i586.tar.gz   -C /usr/lib/jvm

添加环境变量

$ sudo vi ~/.bashrc

加入如下内容：
export JAVA_HOME=/usr/lib/jvm/java
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

执行如下命令，使生效
source ~/.bashrc

配置jdk版本

update-alternatives --install /usr/bin/java java /usr/lib/jvm/java/bin/java 300
update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/java/bin/javac 300
update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/java/bin/jar 300
update-alternatives --install /usr/bin/javah javah /usr/lib/jvm/java/bin/javah 300
update-alternatives --install /usr/bin/javap javap /usr/lib/jvm/java/bin/javap 300

update-alternatives --config java

[root@host-10-10-18-131 ~]# java -version
-bash: /usr/lib/jvm/java/bin/java: No such file or directory
[root@host-10-10-18-131 ~]# ls /usr/lib/jvm/java/bin/java
/usr/lib/jvm/java/bin/java
[root@host-10-10-18-131 ~]# type -path java
/usr/lib/jvm/java/bin/java
[root@host-10-10-18-131 ~]#

原因是java下载出错，重新下载个jdk-8u251-linux-x64.tar.gz 安装

tar -xzvf  jdk-8u251-linux-x64.tar.gz  -C /usr/lib/jvm

二、安装onos

$ git clone https://gerrit.onosproject.org/onos

1.2 配置ONOS环境变量
$ sudo vi /etc/profile
加入如下内容：
export ONOS_ROOT=~/onos
source $ONOS_ROOT/tools/dev/bash_profile

执行如下命令，使生效

source /etc/profile

4 安装Karaf和Maven
下载Karaf和Maven

$wget http://archive.apache.org/dist/karaf/3.0.5/apache-karaf-3.0.5.tar.gz
$wget http://archive.apache.org/dist/maven/maven-3/3.3.9/binaries/apache-maven-3.3.9-bin.tar.g
tar -zxvf apache-maven-3.3.9-bin.tar.gz -C ~/apache/
tar -zxvf apache-karaf-3.0.5.tar.gz -C ~/apache/

export KARAF_ROOT=/root/apache/apache-karaf-3.0.5/
"/etc/profile" 88L, 2198C written
[root@host-10-10-18-131 downloads]# source /etc/profile

export JAVA_HOME=/usr/lib/jvm/java
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH
export ONOS_ROOT=/root/onos
source $ONOS_ROOT/tools/dev/bash_profile
export KARAF_ROOT=/root/apache/apache-karaf-3.0.5/
export MAVEN_ROOT=/root/apache/apache-maven-3.3.9/
export PATH=$JAVA_HOME/bin:$MAVEN_ROOT/bin:$KARAF_ROOT/bin:$PATH
~
~
~
"~/.bashrc" 21L, 567C written
[root@host-10-10-18-131 onos]# source  ~/.bashrc 
[root@host-10-10-18-131 onos]# mvn clean install -DskipTests
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.120 s
[INFO] Finished at: 2020-06-20T07:09:15+00:00
[INFO] Final Memory: 5M/102M
[INFO] ------------------------------------------------------------------------
[ERROR] The goal you specified requires a project to execute but there is no POM in this directory (/root/onos). Please verify you invoked Maven from the correct directory. -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MissingProjectException
[root@host-10-10-18-131 onos]#

[root@host-10-10-18-131 onos]# env | grep JAVA_HOME
JAVA_HOME=/usr/lib/jvm/java
[root@host-10-10-18-131 onos]#

[root@host-10-10-18-131 onos]# mvn clean install  -X switch
Apache Maven 3.3.9 (bb52d8502b132ec0a5a3f4c09453c07478323dc5; 2015-11-10T16:41:47+00:00)
Maven home: /root/apache/apache-maven-3.3.9

[root@host-10-10-18-131 onos]# mvn -version
Apache Maven 3.3.9 (bb52d8502b132ec0a5a3f4c09453c07478323dc5; 2015-11-10T16:41:47+00:00)
Maven home: /root/apache/apache-maven-3.3.9
Java version: 1.8.0_251, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "4.18.0-147.3.1.el8_1.x86_64", arch: "amd64", family: "unix"
[root@host-10-10-18-131 onos]#

当前目录没有pom.xml,进入

/root/onos/tools/build

[root@host-10-10-18-131 build]# pwd
/root/onos/tools/build
[root@host-10-10-18-131 build]# mvn clean install -DskipTests

下载与安装bazel
下载：wget https://copr.fedorainfracloud.org/coprs/vbatts/bazel/repo/epel-7/vbatts-bazel-epel-7.repo (wget 与后面链接一起输入命令行)
再移动到 /etc/yum.repos.d/目录下 ：mv vbatts-bazel-epel-7.repo /etc/yum.repos.d
或者复制：cp vbatts-bazel-epel-7.repo /etc/yum.repos.d
安装：yum install bazel

[root@host-10-10-18-131 ~]# bazel version
WARNING: --batch mode is deprecated. Please instead explicitly shut down your Bazel server using the command "bazel shutdown".
Build label: 1.2.1
Build target: bazel-out/k8-opt/bin/src/main/java/com/google/devtools/build/lib/bazel/BazelServer_deploy.jar
Build time: Tue Nov 26 00:00:00 2019 (1574726400)
Build timestamp: 1574726400
Build timestamp as int: 1574726400
[root@host-10-10-18-131 ~]#

yarn报错error An unexpected error occurred: "https://registry.yarnpkg.com...connect ETIMEDOUT...

yum install -y nodejs

[root@host-10-10-18-131 build]# node -v
v10.19.0
[root@host-10-10-18-131 build]# npm -v
6.13.4
[root@host-10-10-18-131 build]# npm config set registry https://registry.npm.taobao.org
[root@host-10-10-18-131 build]# npm config set disturl https://npm.taobao.org/dist
[root@host-10-10-18-131 build]#

yum -y install gcc
 
yum -y install gcc-c++

yum install -y nodejs

An error occurred during the fetch of repository 'remotejdk11_linux':
   java.io.IOException: Error downloading [https://mirror.bazel.build/openjdk/azul-zulu11.2.3-jdk11.0.1/zulu11.2.3-jdk11.0.1-linux_x64.tar.gz] to /root/.cache/bazel/_bazel_root/548916f1c2f50851181f393ea08eaba4/external/remotejdk11_linux/zulu11.2.3-jdk11.0.1-linux_x64.tar.gz: connect timed out