> 全局开关 | 名称 | 默认值 | 描述 | | ------------------ | ----- | ---------------------------------------- | | unsafe | false | 是否支持对系统级别的类进行增强，打开该开关可能导致把JVM搞挂，请慎重选择！ | | dump | false | 是否支持被增强了的类dump到外部文件中，如果打开开关，class文件会被dump到`/${application working dir}/arthas-class-dump/`目录下，具体位置详见控制台输出 | | batch-re-transform | true | 是否支持批量对匹配到的类执行retransform操作 | | json-format | false | 是否支持json化的输出 | | disable-sub-class | false | 是否禁用子类匹配，默认在匹配目标类的时候会默认匹配到其子类，如果想精确匹配，可以关闭此开关 | | support-default-method | true | 是否支持匹配到default method，默认会查找interface，匹配里面的default method。参考 [#1105](https://github.com/alibaba/arthas/issues/1105) | | save-result | false | 是否打开执行结果存日志功能，打开之后所有命令的运行结果都将保存到`~/logs/arthas-cache/result.log`中 | | job-timeout | 1d | 异步后台任务的默认超时时间，超过这个时间，任务自动停止；比如设置 1d, 2h, 3m, 25s，分别代表天、小时、分、秒 | | print-parent-fields | true | 是否打印在parent class里的filed | ### 查看所有的options `options`{{execute T2}} ```bash $ options LEVEL TYPE NAME VALUE SUMMARY DESCRIPTION -------------------------------------------------------------------------------------------- 0 bool unsafe false Option to support This option enables to proxy function ean system-level class ality of JVM classes. Due to serious security risk a JVM crash is possibly be introduced. Do not activate it un less you are able to manage. 1 bool dump false Option to dump the This option enables the enhanced clas ean enhanced classes ses to be dumped to external file for further de-compilation and analysis. 1 bool batch-re-tr true Option to support This options enables to reTransform c ean ansform batch reTransform lasses with batch mode. Class 2 bool json-format false Option to support This option enables to format object ean JSON format of obj output with JSON when -x option selec ect output ted. 1 bool disable-sub false Option to control This option disable to include sub cl ean -class include sub class ass when matching class. when class matchin g 1 bool save-result false Option to print co This option enables to save each comm ean mmand's result to and's result to log file, which path log file is ${user.home}/logs/arthas-cache/res ult.log. 2 Stri job-timeout 1d Option to job time This option setting job timeout,The u ng out nit can be d, h, m, s for day, hour, minute, second. 1d is one day in defa ult 1 bool print-paren true Option to print al This option enables print files in pa ean t-fields l fileds in parent rent class, default value true. class ``` ### 获取option的值 `options json-format`{{execute T2}} ``` $ options json-format LEVEL TYPE NAME VALUE SUMMARY DESCRIPTION -------------------------------------------------------------------------------------------- 2 bool json-format false Option to support This option enables to format object ean JSON format of obj output with JSON when -x option selec ect output ted. ``` > 默认情况下`json-format`为false，如果希望`watch`/`tt`等命令结果以json格式输出，则可以设置`json-format`为true。 ### 设置指定的option 例如，想打开执行结果存日志功能首先查看日志，发现无记录： `cat /root/logs/arthas-cache/result.log`{{execute T2}} 输入如下命令即可激活记录日志功能： `options save-result true`{{execute T2}} ``` $ options save-result true NAME BEFORE-VALUE AFTER-VALUE ---------------------------------------- save-result false true ``` 稍候片刻，再次查看，发现出现记录： `cat /root/logs/arthas-cache/result.log`{{execute T2}} ```bash $ cat /root/logs/arthas-cache/result.log 2020-07-26 04:27:08 [arthas-command-execute] INFO result - 2020-07-26 04:27:08 [arthas-command-execute] INFO result - ```