centos7 安装donet 1. centos7-安装dotnet工具安装epel源[root@sonarqube config]# yum install epel-release -y 导入dotnet源 [root@sonarqube config]# rpm -Uvh https://packages.microsoft.com/config/rhel/7/packages-microsoft-prod.rpm 查找dotnet安装包 [root@sonarqube config]# yum search dotnet-sdk安装最新dotnet[root@sonarqube config]# yum -y install dotnet-sdk-6.0验证安装是否成功[root@sonarqube config]# dotnet --version 6.0.1022. dotnet build报错问题描述: linux下dotnet build 时候出现 .1.201/NuGet.targets(124,5): error : Unable to load the service index for source https://api.nuget.org/v3/index.json.解决方案解决: /etc/pki/tls/certs/ 下面少了证书 ca-certificates.crt 拷贝下面内容到证书里面-----BEGIN CERTIFICATE----- MIIGKjCCBRKgAwIBAgIQAqQdLHDmymcvfOktofoYODANBgkqhkiG9w0BAQsFADBE MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMR4wHAYDVQQDExVE aWdpQ2VydCBHbG9iYWwgQ0EgRzIwHhcNMjAwNTI2MDAwMDAwWhcNMjEwNDIxMTIw MDAwWjBqMQswCQYDVQQGEwJVUzETMBEGA1UECBMKV2FzaGluZ3RvbjEQMA4GA1UE BxMHU2VhdHRsZTEZMBcGA1UEChMQQW1hem9uLmNvbSwgSW5jLjEZMBcGA1UEAwwQ 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在Ubuntu16.04上启用TCP-BBR BBR简介BBR 是 Google 推出的一个「TCP 拥塞控制算法」，它是以 Linux 内核模块的形式加载，可以最大化 Linux Server 的网络吞吐量。简单地说，开启 BBR 的 Linux Server 和不开启 BBR 的 Linux Server，在持续传输数据方面可以有非常大的不同。BBR 尽管还没有在主流发行版中默认开启，但 Google 已经在 YouTube 网站上实践了很久，可以说是很成熟的一样技术了。检测 BBR 是否开启在开始之前，先看看 BBR 是否已经启用了，执行这条指令可以返回当前 Linux 内核可以使用的 TCP 拥堵控制算法：sudo apt-get cleansudo apt-get updatesysctl net.ipv4.tcp_available_congestion_control例如，在我的Server上返回了如下内容：net.ipv4.tcp_available_congestion_control = cubic reno可以看到是没有BBR的，因为默认的 Ubuntu 16.04 用的是 Linux 4.4.0 内核，所以自然是看不到 BBR 的。我们再次确认下系统当前启用的拥塞算法：sysctl net.ipv4.tcp_congestion_control返回的内容是：net.ipv4.tcp_congestion_control = cubic可以看到系统使用的是 cubic 这个默认的算法。接下去我们通过最标准的模式来为这台 Ubuntu 16.04 启用 BBR安装 4.10+ 新内核BBR 只能配合 Linux Kernel 4.10 以上内核才能使用。但是在 Ubuntu 16.04 上怎么使用 4.10 呢？难道要手动下载和安装吗？不能！这会有一个安全隐患，手动下载安装的新内核，无法保证后续能得到及时的安全更新。那么怎么办？这里推荐使用 HWE 版本的内核，它就在官方源里。HWE，即：HareWare Enablement，是专门为在老的系统上支持新的硬件而推出的内核。你可以像安装其他软件包一样在 Ubuntu 16.04 里非常容易的安装它，只需要执行下面的命令：sudo apt-get install linux-generic-hwe-16.04对！只需要这样就OK了！安装好以后重启系统，然后输入：uname -a我的Server输出如下：Linux oneone 4.15.0-74-generic #83~16.04.1-Ubuntu SMP Wed Dec 18 04:56:23 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux可以看到系统内核已经升级到4.15.0了。为Ubuntu 16.04 启用 BBR接下来就可以为新内核装载 BBR 模块了，分别执行：sudo modprobe tcp_bbr echo "tcp_bbr" | sudo tee -a /etc/modules-load.d/modules.conf接下来我们再来查看系统支持的拥塞算法，可以看到BBR已经在里面了：sysctl net.ipv4.tcp_available_congestion_control返回：net.ipv4.tcp_available_congestion_control = reno cubic bbr接下来就正式启用BBR，把它设为系统的默认拥塞算法，分别执行：echo "net.core.default_qdisc=fq" | sudo tee -a /etc/sysctl.confecho "net.ipv4.tcp_congestion_control=bbr" | sudo tee -a /etc/sysctl.confsudo sysctl -p最后，再来验证一下是否设置成功，可以看到BBR已经是默认算法：sysctl net.ipv4.tcp_congestion_control返回：net.ipv4.tcp_congestion_control = bbr