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01 Tomcat 安裝與測(cè)試

1.1 安裝 Tomcat

安裝Tomcat的本體和相關(guān)官方測(cè)試demo，參考鏈接

apt-get install tomcat8 -y # 安裝Tomcat本體
apt-get install tomcat8-docs tomcat8-examples tomcat8-admin -y # 安裝測(cè)試demo

1.2 Tomcat 啟動(dòng)檢查

systemctl start tomcat8 # 啟動(dòng)Tomcat
systemctl status tomcat8
netstat -lntup|grep 8080 # 端口測(cè)試
lsof -i:8080
# 端口檢查得到輸出
COMMAND  PID    USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
java    4502 tomcat8   63u  IPv6 125026      0t0  TCP *:http-alt (LISTEN)

1.3 查看 Tomcat 日志

啟動(dòng)tomcat之后，使用本地瀏覽器訪問(wèn)http://localhost:8080/訪問(wèn)tomcat頁(yè)面，在頁(yè)面中點(diǎn)擊按鈕產(chǎn)生HTTP請(qǐng)求，讓tomcat產(chǎn)生日志

tail -f /var/log/tomcat8/localhost_access_log.2021-08-01.txt

02 修改 Tomcat 日志為 Json 格式

打開(kāi)Tomcat的server.xml配置文件進(jìn)行修改，在日志文件中的文末修改如下對(duì)應(yīng)設(shè)置

# 編輯配置文件
vim /etc/tomcat8/server.xml
#將以下內(nèi)容替換配置文件中135行對(duì)應(yīng)內(nèi)容
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
               prefix="localhost_access_log" suffix=".log"
               pattern="{&quot;client&quot;:&quot;%h&quot;,  &quot;client user&quot;:&quot;%l&quot;,   &quot;authenticated&quot;:&quot;%u&quot;,   &quot;access time&quot;:&quot;%t&quot;,     &quot;method&quot;:&quot;%r&quot;,   &quot;status&quot;:&quot;%s&quot;,  &quot;send bytes&quot;:&quot;%b&quot;,  &quot;Query?string&quot;:&quot;%q&quot;,  &quot;partner&quot;:&quot;%{Referer}i&quot;,  &quot;Agent version&quot;:&quot;%{User-Agent}i&quot;}"/>
# 查看修改內(nèi)容
cat -n /etc/tomcat8/server.xml

重新啟動(dòng)tomcat并查看日志，檢驗(yàn)是否配置成功，產(chǎn)生新的日志還是需要通過(guò)使用瀏覽器訪問(wèn)8080端口，在Tomcat的demo樣例中對(duì)tomcat發(fā)送請(qǐng)求產(chǎn)生日志。

# 先清空日志
> /var/log/tomcat8/localhost_access_log.2021-08-02.txt 
# 重新啟動(dòng)Tomcat
systemctl restart tomcat8
# 查看日志
root@master:/var/log/tomcat8# tail -f /var/log/tomcat8/localhost_access_log.2021-08-02.log  # 查看日志命令
{"client":"172.16.255.1", "client user":"-", "authenticated":"-", "access time":"[02/Aug/2021:02:23:55 +0000]", "method":"GET /examples/servlets/images/return.gif HTTP/1.1", "status":"200",  "send bytes":"1231",  "Query?string":"", "partner":"http://172.16.255.131:8080/examples/servlets/", "Agent version":"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36"}
{"client":"172.16.255.1", "client user":"-", "authenticated":"-", "access time":"[02/Aug/2021:02:23:57 +0000]", "method":"GET /examples/servlets/servlet/RequestParamExample HTTP/1.1", "status":"200",  "send bytes":"673",  "Query?string":"", "partner":"http://172.16.255.131:8080/examples/servlets/", "Agent version":"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36"}
{"client":"172.16.255.1", "client user":"-", "authenticated":"-", "access time":"[02/Aug/2021:02:24:01 +0000]", "method":"GET /host-manager/html HTTP/1.1", "status":"401",  "send bytes":"2044",  "Query?string":"", "partner":"http://172.16.255.131:8080/", "Agent version":"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36"}

03 配置 Filebeat 采集 Tomcat 日志

新增Filebeat輸入配置，將tomcat日志參照Nginx的Json格式日志采集方式配置如下

vim小技巧：將連續(xù)多行內(nèi)容復(fù)制對(duì)應(yīng)位置使用t命令，在Normal模式中輸入:2,7t11表示將第二到第七行的內(nèi)容復(fù)制到第十一行開(kāi)頭；將連續(xù)多行內(nèi)容移動(dòng)對(duì)應(yīng)位置使用m命令，在Normal模式中輸入:2,7m11表示將第二到第七行的內(nèi)容移動(dòng)到第十一行開(kāi)頭

vim小技巧：在輸入內(nèi)容時(shí)要使用到某個(gè)文件路徑可以是用!命令然后使用shell命令查看內(nèi)容，例如查看某個(gè)文件的路徑可以在Normal模式中輸入:!ls /var/log/tomcat8/...提示

# ================== Filebeat inputs ===============
# ------------------------------Tomcat----------------------------------
- type: log
  enabled: true
  paths:
    # - /var/log/tomcat8/localhost_access_log.2021-08-02.log
    # 為了能夠采集所有日期的日志，將文件名中的指定日期改成通配符`*`
    - /var/log/tomcat8/localhost_access_log.*.log
  json.keys_under_root: true
  json.overwrite_keys: true
  tags: ["tomcat"]

# ================================== Outputs ===================================
# ---------------------------- Elasticsearch Output ----------------------------
output.elasticsearch:
  hosts: ["172.16.255.131:9200"]
  indices:
      - index: "nginx-access-%{[agent.version]}-%{+yyyy.MM}"
        when.contains:
            tags: "access"
      - index: "nginx-error-%{[agent.version]}-%{+yyyy.MM}"
        when.contains:
            tags: "error"
# 在輸出配置中添加如下索引設(shè)置識(shí)別tomcat日志，值得注意的時(shí)這里不需要再重新編輯template設(shè)置，應(yīng)該pattern配置只在第一次使用時(shí)進(jìn)行匹配識(shí)別
      - index: "tomcat-access-%{[agent.version]}-%{+yyyy.MM}"
        when.contains:
            tags: "tomcat"