Unable to create tempDir. java.io.tmpdir is set to /tmp

磁盘挂载后，启动报错 Unable to create tempDir. java.io.tmpdir is set to /tmp

[2022-03-30 17:12:06.596] WARN [main] AbstractApplicationContext.java:558 - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to create tempDir. java.io.tmpdir is set to /tmp
[2022-03-30 17:12:06.615] INFO [main] ConditionEvaluationReportLoggingListener.java:136 - 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
[2022-03-30 17:12:06.619] ERROR [main] SpringApplication.java:837 - Application run failed
org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to create tempDir. java.io.tmpdir is set to /tmp
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:161)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:544)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750)
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
        at com.thoth.boot.admin.ThothAdminApplication.main(ThothAdminApplication.java:19)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:109)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)
        at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:88)
Caused by: org.springframework.boot.web.server.WebServerException: Unable to create tempDir. java.io.tmpdir is set to /tmp
        at org.springframework.boot.web.server.AbstractConfigurableWebServerFactory.createTempDir(AbstractConfigurableWebServerFactory.java:196)
        at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.prepareContext(TomcatServletWebServerFactory.java:210)
        at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:190)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:176)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:158)
        ... 17 common frames omitted
Caused by: java.io.IOException: Read-only file system
        at java.io.UnixFileSystem.createFileExclusively(Native Method)
        at java.io.File.createTempFile(File.java:2061)
        at java.io.File.createTempFile(File.java:2107)
        at org.springframework.boot.web.server.AbstractConfigurableWebServerFactory.createTempDir(AbstractConfigurableWebServerFactory.java:188)
        ... 21 common frames omitted

更改 /tmp目录 的权限以授予您的用户访问权限

[root@iZuf66gcq71y5hlfv02w6aZ 50002_push]# chmod -R 777 /tmp
chmod: changing permissions of ‘/tmp’: Read-only file system

 [root@iZuf66gcq71y5hlfv02w6aZ ~]# mount -o remount,rw /

1系统文件

  mount -rw -o remount /

2移动硬盘或者U盘

  sudo mount -o remount,rw /dev/sdc1

此时，进入文件系统，发现文件加锁，这是加权限即可

sudo chmod +777 *

1.mount 命令 [-t 文件系统] [-L 卷标名] [-o 特殊选项] 设备文件名 挂载点

-l 查询系统中已经挂载的设备，-l 会显示卷标

-a 依据配置文件/etc/fstab的内容，自动挂载

-t 系统文件，加入系统类型指定挂载类型，可以ext3，ext4， iso9660等系统文件

-L 卷标名：挂载指定分区，而不是设备文件名挂载

-o 特殊选择：可以指定挂载额外选项

atime/noatime 更新访问时间/不更新访问时间。访问分区时，是否更新文件的访问时间，默认更新

async/sync 异步/同步 默认异步

auto/noauto 自动/手动 mount -a命令执行时，是否会自动安装/etc/fstab 文件内容挂载，默认自动

defaults 定义默认值，相当于rw、suid、dev、exec、auto、nouser、async这七个选择

exec/noexec 执行/不执行，设定师傅允许文件系统中执行可执行文件，默认是exec允许

remount 重新挂载已经挂载的文件系统，一般用于修改特殊权限

rw/ro 读写/只读，文件系统挂载时，是否有读写的权限，默认rw

suid/nosuid 具有/不具有SUID权限，设定文件系统是否具有SUID权限，默认具有

user/nouser 允许/不允许普通用户挂载，设定文件系统是否允许普通用户挂载，默认不允许，只有root可以挂载分区

usrquata 写入代表文件系统支持用户磁盘配额，默认不支持

grpquata 写入代表文件系统支持组磁盘配额，默认不允许

eg： mount -o remount,noexec /home 让 /home目录下不能执行可执行文件