Phenomenon:
As shown in the figure, use ls to view the files in the directory. It is found that the file name has garbled codes and strange symbols, which cannot be deleted by RM command;
Solution:
At this time, the file can be deleted through the inode of the file
Operation process:
Use LS – Il to view the file inode
Use the command find- Inum XXXX – delete delete delete file
End
An error is reported in the make command for configuring redis on Linux
1. After decompressing the redis file, execute the make command and an error is reported:
Solution:
The reason is that the GCC version of Linux system is too low, and the GCC installed by Yum is 4.8.5.GCC needs to be upgraded
Command line input:
yum -y install centos-release-scl
yum -y install devtoolset-9-gcc devtoolset-9-gcc-c++ devtoolset-9-binutils
scl enable devtoolset-9 bash
echo "source /opt/rh/devtoolset-9/enable" >> /etc/profile
gcc -v
Decompress the redis file again
Execute the make command, as shown in the following figure, OK!
Execute the startup specification after entering the bin directory
./solr start
report errors
What should I do?
View system limits
ulimit -a
Now you need to change the system limit and log in to the root account
Locate the file/etc/security/limits At the end of conf, add the following two lines [added by default in some systems]
* soft nofile 65535 * hard nofile 65535
Then locate the file/etc/security/limits d/20-nproc.conf
Change 4096 to 65535
Login again and take effect after modification
Question:
After Linux restarts, an error is reported when starting the nginx server
Solution:
1. Use the command CD/usr/local/nginx/conf to enter the specified directory
2. Use the command VI nginx Conf modify the configuration file # and remove the # number in the figure
3. Change to PID/usr/local/nginx/logs/nginx.pid;
4. Use the command MKDIR/usr/local/nginx/logs to create a directory
5. Start nginx service
Error Messages:
E325: ATTENTION
Found a swap file by the name “.server.properties.swp”
owned by: root dated: Thu Jan 1 12:02:39 2022
file name: /server.properties
modified: YES
user name: root host name: wang.localdomain
process ID: 10718 (still running)
While opening file “server.properties”
dated: Thu Jan 1 12:02:39 2022
(1) Another program may be editing the same file. If this is the case,
be careful not to end up with two different instances of the same
file when making changes. Quit, or continue with caution.
(2) An edit session for this file crashed.
Error: If this is the case, use “:recover” or “vim -r server.properties”
to recover the changes (see “:help recovery”).
Error: If you did this already, delete the swap file “.server.properties.swp”
to avoid this message.
Solution:
First use (individual tutorials have said that the deleted files are in the root directory, at least I didn’t find them)
ls -a
to see if there is a .swp file that opens with an error
For example, the one I opened with an error was server.properties
In this file directory use ls -a
Then use rm -f
Then the error report disappears.
If you are sure that GCC and G are installed++
Then update GCC and G + +:
apt-get install gcc
apt-get install gcc
Add make tool:
apt-get install gcc automake autoconf libtool make
#Background
When the hard disk has a system, the format prompt indicates that the system cannot format
Input: mkfs ext4 /dev/nvme0n1
Error reporting:/dev/nvme0n1 is appropriate in use by the system; will not make a filesystem here!
#Solution
Prompt that/dev/sdk1 is in use/ Dev/sdk1 is being managed by DM, so when we create the file system, we will be prompted with an error. We can manually remove it to create the file system normally. The operation is as follows:
Check:
dmsetup status
Clear:
dmsetup remove_all
Check:
dmsetup status
Execute the command: mkfs.ext4 /dev/nvme0n1
[FTP solution] vsftpd (FTP server) problem of windows accessing Ubuntu 200 switching to ASCII mode, 227 entering passive mode (0,0,0
Question: as follows,
—————————
FTP folder error
———————————————-
an error occurred while opening the folder on the FTP server. Check that you have permission to access the folder.
Details:
200 switching to ASCII mode
227 Entering Passive Mode (0,0,0,0,227,175).
———————————————–
OK
—————————
Solution:
A rather bullshit approach
Operating under Windows:
Open network and sharing center and find Internet Options -> [advanced] this page,
Cancel “use passive FTP (compatible with firewall and DSL modem)”
phenomenon
The error reported when starting MySQL service is as follows:
[root@linmo mysql]# systemctl status mysqld
● mysqld.service - MySQL Server
Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
Active: failed (Result: start-limit) since Wed 2021-10-12 09:13:18 UTC; 4s ago
Process: 1015 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=127)
Process: 1991 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
Oct 12 09:13:17 linmo systemd[1]: mysqld.service: control process exited, code=exited status=127
Oct 12 09:13:17 linmo systemd[1]: Failed to start MySQL Server.
Oct 12 09:13:17 linmo systemd[1]: Unit mysqld.service entered failed state.
Oct 12 09:13:17 linmo systemd[1]: mysqld.service failed.
Oct 12 09:13:18 linmo systemd[1]: mysqld.service holdoff time over, scheduling restart.
Oct 12 09:13:18 linmo systemd[1]: start request repeated too quickly for mysqld.service
Oct 12 09:13:18 linmo systemd[1]: Failed to start MySQL Server.
Oct 12 09:13:18 linmo systemd[1]: Unit mysqld.service entered failed state.
Oct 12 09:13:18 linmo systemd[1]: mysqld.service failed.
[root@linmo mysql]#
reason
The system lacks dependent packages: libaio, numactl;
Solution
Install missing dependent packages: libaio, numactl
# install libaio
yum install libaio
# install numactl
#wget wget http://mirror.centos.org/centos-7/7/os/x86_64/Packages/numactl-libs-2.0.9-5.el7_1.x86_64.rpm
# installl numactl
rpm -ivh numactl-libs-2.0.9-5.el7_1.x86_64.rpm
# install perl
yum isntall perl
End
org.springframework.context.ApplicationContextException: Failed to start bean 'webServerStartStop'; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat server at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:181) ~[spring-context-5.3.13.jar!/:5.3.13] at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:54) ~[spring-context-5.3.13.jar!/:5.3.13] at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:356) ~[spring-context-5.3.13.jar!/:5.3.13] at java.lang.Iterable.forEach(Iterable.java:75) ~[na:1.8.0_171] at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:155) ~[spring-context-5.3.13.jar!/:5.3.13] at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:123) ~[spring-context-5.3.13.jar!/:5.3.13] at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:935) ~[spring-context-5.3.13.jar!/:5.3.13] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:586) ~[spring-context-5.3.13.jar!/:5.3.13] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.5.7.jar!/:2.5.7] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:765) [spring-boot-2.5.7.jar!/:2.5.7] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:445) [spring-boot-2.5.7.jar!/:2.5.7] at org.springframework.boot.SpringApplication.run(SpringApplication.java:338) [spring-boot-2.5.7.jar!/:2.5.7] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1354) [spring-boot-2.5.7.jar!/:2.5.7] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343) [spring-boot-2.5.7.jar!/:2.5.7] at com.pn.boot.MybatisLogApplication.main(MybatisLogApplication.java:12) [classes!/:0.0.1-SNAPSHOT] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_171] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_171] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_171] at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_171] at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49) [3-boot-mybatis-log-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT] at org.springframework.boot.loader.Launcher.launch(Launcher.java:108) [3-boot-mybatis-log-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT] at org.springframework.boot.loader.Launcher.launch(Launcher.java:58) [3-boot-mybatis-log-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT] at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:88) [3-boot-mybatis-log-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT] Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat server at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.start(TomcatWebServer.java:229) ~[spring-boot-2.5.7.jar!/:2.5.7] at org.springframework.boot.web.servlet.context.WebServerStartStopLifecycle.start(WebServerStartStopLifecycle.java:43) ~[spring-boot-2.5.7.jar!/:2.5.7] at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:178) ~[spring-context-5.3.13.jar!/:5.3.13] ... 22 common frames omitted Caused by: java.lang.IllegalArgumentException: standardService.connector.startFailed at org.apache.catalina.core.StandardService.addConnector(StandardService.java:238) ~[tomcat-embed-core-9.0.55.jar!/:na] at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.addPreviouslyRemovedConnectors(TomcatWebServer.java:282) ~[spring-boot-2.5.7.jar!/:2.5.7] at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.start(TomcatWebServer.java:213) ~[spring-boot-2.5.7.jar!/:2.5.7] ... 24 common frames omitted Caused by: org.apache.catalina.LifecycleException: Protocol handler start failed at org.apache.catalina.connector.Connector.startInternal(Connector.java:1075) ~[tomcat-embed-core-9.0.55.jar!/:na] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.55.jar!/:na] at org.apache.catalina.core.StandardService.addConnector(StandardService.java:234) ~[tomcat-embed-core-9.0.55.jar!/:na] ... 26 common frames omitted Caused by: java.net.BindException: 地址已在使用 at sun.nio.ch.Net.bind0(Native Method) ~[na:1.8.0_171] at sun.nio.ch.Net.bind(Net.java:433) ~[na:1.8.0_171] at sun.nio.ch.Net.bind(Net.java:425) ~[na:1.8.0_171] at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223) ~[na:1.8.0_171] at org.apache.tomcat.util.net.NioEndpoint.initServerSocket(NioEndpoint.java:271) ~[tomcat-embed-core-9.0.55.jar!/:na] at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:226) ~[tomcat-embed-core-9.0.55.jar!/:na] at org.apache.tomcat.util.net.AbstractEndpoint.bindWithCleanup(AbstractEndpoint.java:1213) ~[tomcat-embed-core-9.0.55.jar!/:na] at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:1299) ~[tomcat-embed-core-9.0.55.jar!/:na] at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:614) ~[tomcat-embed-core-9.0.55.jar!/:na] at org.apache.catalina.connector.Connector.startInternal(Connector.java:1072) ~[tomcat-embed-core-9.0.55.jar!/:na] ... 28 common frames omitted
The reason for Linux tomcat port occupancy is to close all the tomcats that are enabled in Linux.