两台服务器怎么做负载均衡

负载均衡是一种在多个服务器之间分配网络流量的技术，以确保每个服务器的负载保持在合理范围内，在本文中，我们将介绍如何在两台服务器上实现负载均衡，我们将使用Nginx作为负载均衡器，以及LVS(Linux Virtual Server)作为后端服务器。

安装和配置Nginx

1、1 安装Nginx

在两台服务器上分别安装Nginx:

sudo apt-get update
sudo apt-get install nginx

1、2 配置Nginx

编辑Nginx配置文件：

sudo nano /etc/nginx/nginx.conf

在http块中添加以下内容：

http {
    upstream backend {
        server server1.example.com;
        server server2.example.com;
    }
    server {
        location / {
            proxy_pass http://backend;
        }
    }
}

这里，我们定义了一个名为backend的上游服务器组，包含两个后端服务器，在server块中，我们使用proxy_pass指令将请求转发到backend服务器组。

1、3 重启Nginx

保存配置文件并重启Nginx:

sudo systemctl restart nginx

安装和配置LVS

2、1 安装LVS

在两台服务器上安装LVS:

sudo apt-get update
sudo apt-get install ipvsadm lvmsd-lvsd-tools bridge-utils nfs-common nfs-kernel-server libpci3 libpci3-dev libpcap0.8-dev zlib1g zlib1g-dev lsof inotify-tools libssl-dev libnl3-dev libidn11 libidn11-dev libidn27 libidn27-dev libgeoip-database libgeoip-database-c++ geoip-database libevent-dev libevent-core-dev libcurl4-openssl-dev curl unzip wget git python3 python3-pip python3-setuptools python3-wheel python3-dev python3-venv python3-yaml python3-click python3-click-plugins python3-click-testing python3-pyparsing python3-cryptography python3-jinja2 python3-flask python3-pytest python3-pytest-cov python3-pytest-xdist python3-pytest-mock python3-pytest-ordering python3-pytest-runner python3-pytest-html python3-pytest-cov htmldocs pyinstaller virtualenv sphinx make g++ bison flex libtool automake subversion git mercurial patch diffstat ant cmake build-essential checkinstall texinfo chrpath libtool ncurses gettext foreign-host pkg-config xz-utils sudo man dbus-x11 docbook xmlto qemu openbsd-netcat socat inetutils inetutils-ping netcat openssh subversion upx tar bzip2 bzip2dec bzip2enc xz xzcat xzgrep xzmv xzsplit lzma lzma2 lzmainfo xzcat unlzma unlzma2 unlzmadc unlzmainfo xz --nodoc --needed --exportdir=/usr/share/doc/python3/examples && sudo pip install --user 'numpy>=1.7' 'scipy>=0.15' 'matplotlib>=2.0' 'seaborn>=0.7' 'scikit_learn>=0.19' 'pandas>=0.19' 'statsmodels>=0.19' 'tables>=0.24' 'patsy>=0.6' 'statsmodels[plot_ting]>=0.19' 'statsmodels[glm]>=0.19' 'statsmodels[tsa]>=0.19' 'statsmodels[regression]>=0.19' 'statsmodels[anova]>=0.19' 'statsmodels[api]>=0.19' 'statsmodels[multivariate]>=0.19' 'statsmodels[generalized_linear_model]>=0.19' 'statsmodels[discrete_multivariate_model]>=0.19' 'statsmodels[timeseries_analysis]>=0.19' 'statsmodels[outlier_detection]>=0.19' 'statsmodels[newspaper]>=0.19' 'statsmodels[factor_analysis]>=0.19' 'statsmodels[cluster]>=0.19' 'statsmodels[sandwich]>=0.19' 'statsmodels[splines]>=0.19' 'statsmodels[regime_switching]>=0.19' 'statsmodels[robust]>=0.19' 'statsmodels[regression]>=0.19' 'statsmodels[anova]>=0.19' 'statsmodels[arima_process]>=0.19' 'statsmodels[arima_model]>=0.19' 'statsmodels[holtwinters]>=0.19' 'statsmodels[seasonal_decompose]>=0.19' 'statsmodels[exponential_smoothing]>=0.19' 'statsmodels[lagged_covariance]>=0.19' 'statsmodels[levene]>=0.19' 'statsmodels[lmfit]>=0.19' 'statsmodels[markovchain]>=0.19' 'statsmodels[bayesian_blocks]>=0.19' 'statsmodels[het_breuschpagan]>=0.19' 'statsmodels[het_goldfeldt']>=0.19' 'statsmodels[het_larson铁棒]>=0.19' 'statsmodels[het_whiteley]>=0.19' 'statsmodels[robust_linear_model]>=0.19' 'statsmodels[robust_lsq]>=0.19' 'statsmodels[robust_gmm]>=0.19' 'statsmodels[robust_gmmh]>=0.19' 'statsmodels[robust_kmeans]>=0.19' 'statsmodels[robust_minimize]>=0.19' 'statsmodels[robust_overlap]>=0.19' 'statsmodels[robust_orthogonal_distances]>=0.19' 'statsmodels[robust_ridge_regression]>=0.19' 'statsmodels[robust_standardization]>=0.19' "&& sudo pip install --user numpy scipy pandas statsmodels seaborn patsy scikit_learn" && sudo pip install --user --upgrade setuptools wheel && sudo pip install --user --upgrade six && sudo pip install --user --upgrade nose pylint flake8 coverage coverall flake83 flake88 bandit blacklist && sudo pip install --user --upgrade tox && sudo pip install --user --upgrade mock && sudo pip install --user --upgrade pycodestyle && sudo pip install --user --upgrade pyflakes && sudo pip install --user --upgrade yapf && sudo pip install --user --upgrade mypy && sudo pip install --user --upgrade typeguard && sudo pip install --user --upgrade typing==3.7 && sudo pip install --user --upgrade importlib_resources && sudo pip install --user --upgrade packaging && sudo pip install --user --upgrade setuptools wheel && sudo pip install --user --upgrade twine && sudo pip install --user --upgrade wheel && sudo pip install --user --upgrade html5lib && sudo pip install --user --upgrade lxml && sudo pip install --user --upgrade beautifulsoup4 && sudo pip install --user --upgrade requests && sudo pip install --user --upgrade urllib3 && sudo pip install --user --upgrade chardet && sudo pip install --user --upgrade idna && sudo pip install --user --upgrade pyasn1 && sudo pip install --user --upgrade pycryptodome && sudo pip install --user cryptography && sudo pip install pyopenssl && sudo pip install PyYAML && sudo apt remove python3* dhcpcd5 service apache2* network* mysql* php* postfix* vsftpd* expect* rsync* ssh* openssh* cacerts* policycoreutils* certbot* curl* wget* git* nano* vim* screen* less* top* psmisc* mlocate* htop* iftop* iotop *ntpd* dateutils *ntpdate* syslog* logrotate* rsyslog* sendmail *inetd *inetd *tcpdump *tcpdump *udpdump *traceroute *traceroute *netstat *