Munin

Munin是一套Perl撰写的监控软件。

安装

Munin目前已经算成熟，更新幅度不会太大，加上Ubuntu内的版本都还算够新，可以直接安装Ubuntu内的版本，节点端只需要安装munin-node：

sudo apt install -y munin-node; sudo apt clean

服务器则是安装munin：

sudo apt install -y munin; sudo apt clean

设定

节点端

节点端需要把服务器的IP位置加入allow列表（要注意这边的设计是吃Regular Expression），另外防火墙的设定只要把4949/tcp打开即可（预设值，在/etc/munin/munin-node.conf内可以修改）。

服务器端

服务器端的设定，先将Munin设定为CGI模式（事实上会是FastCGI模式），这需要修改/etc/munin/munin-conf.d/cgi.conf：

graph_strategy cgi
html_strategy cgi
cgiurl_graph /munin-cgi/munin-cgi-graph

接着是修正Ubuntu下的档案权限：

sudo chown munin:adm /var/log/munin/munin-cgi-graph.log /var/log/munin/munin-cgi-html.log

另外是systemd的设定档，包含了/lib/systemd/system/munin-cgi-graph.service：

#
[Unit]
Description=Munin CGI Graph FastCGI daemon
After=remote-fs.target

[Service]
ExecStart=/usr/bin/spawn-fcgi -s /var/run/munin/fastcgi-graph.sock -P /var/run/munin/fastcgi-graph.pid -U www-data -u munin -g munin /usr/lib/munin/cgi/munin-cgi-graph
PIDFile=/var/run/munin/fastcgi-graph.pid
Restart=always
RestartSec=1
Type=simple

[Install]
WantedBy=multi-user.target

以及/lib/systemd/system/munin-cgi-html.service：

#
[Unit]
Description=Munin CGI HTML FastCGI daemon
After=remote-fs.target

[Service]
ExecStart=/usr/bin/spawn-fcgi -s /var/run/munin/fastcgi-html.sock -P /var/run/munin/fastcgi-html.pid -U www-data -u munin -g munin /usr/lib/munin/cgi/munin-cgi-html
PIDFile=/var/run/munin/fastcgi-html.pid
Restart=always
RestartSec=1
Type=simple

[Install]
WantedBy=multi-user.target

重读systemd设定，并且设成开机执行，然后跑起来：

sudo systemctl daemon-reload; sudo systemctl enable munin-cgi-graph.service; sudo systemctl enable munin-cgi-html.service; sudo service munin-cgi-graph.service start; sudo service munin-cgi-html.service start

然后是nginx的设定：

location ^~ /munin-cgi/munin-cgi-graph/ {
    fastcgi_split_path_info ^(/munin-cgi/munin-cgi-graph)(.*);
    fastcgi_param PATH_INFO $fastcgi_path_info;
    fastcgi_pass unix:/var/run/munin/fastcgi-graph.sock;
    include fastcgi_params;
}

location /munin/static/ {
    alias /etc/munin/static/;
}

location /munin/ {
    fastcgi_split_path_info ^(/munin)(.*);
    fastcgi_param PATH_INFO $fastcgi_path_info;
    fastcgi_pass unix:/var/run/munin/fastcgi-html.sock;
    include fastcgi_params;
}

让nginx重读设定档后应该就可以在https://www.example.com/munin/看到内容：

sudo pkill -1 nginx

外部链接

• 官方网站 （英文）