To access sites that use HTTP Basic authentication with curl, use command
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curl -u USERNAME_HERE:PASSWORD_HERE http://domain.extn |
Or
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curl -u USERNAME_HERE http://domain.extn |
If you don’t specify password, curl will promt for password. See curl […]
Imunify360 is a security software that include antivirus, firewall, intruder detection and web application firewall (WAF). It can block attacks and malware uploads in real time. To start installation, run the following script with your activation key:
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wget https://repo.imunify360.cloudlinux.com/defence360/i360deploy.sh bash i360deploy.sh --key <activation_key> |
If you have an IP-based license, run the same script with no arguments:
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wget https://repo.imunify360.cloudlinux.com/defence360/i360deploy.sh bash i360deploy.sh |
See imunify […]
On Linux Server, history command shows previously executed commands. If you have many people working on a server, it is better log IP address of the user who run the command along with time for security reason. To log, IP and date, create file
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vi /usr/local/bin/sok_detailed_history |
In the file, add
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#!/bin/bash # Author: ServerOK.in # Email: [email protected] # Web; https://serverok.in SET_IP=`echo -n $SSH_CLIENT|cut -d' ' -f1` if [[ `tail -n1 ~/.bash_history|rev|cut -c -4|rev` != `date +%Y` ]] then sed -i "\$s/$/ #entered by `echo -n $SET_IP` on `date`/g" ~/.bash_history fi |
Make it executable
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chmod 755 /usr/local/bin/sok_detailed_history |
Create […]
When starting elasticsearch on CentOS 7 server, it failed with error. Checking the logs with
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journalctl -u elasticsearch |
Found following errors
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systemd[1]: Starting Elasticsearch... systemd-entrypoint[2438]: Exception in thread "main" java.lang.RuntimeException: starting java failed with [1] systemd-entrypoint[2438]: output: systemd-entrypoint[2438]: # systemd-entrypoint[2438]: # There is insufficient memory for the Java Runtime Environment to continue. systemd-entrypoint[2438]: # Native memory allocation (mmap) failed to map 16710107136 bytes for committing reserved memory. systemd-entrypoint[2438]: # An error report file with more information is saved as: systemd-entrypoint[2438]: # /var/log/elasticsearch/hs_err_pid2576.log systemd-entrypoint[2438]: error: systemd-entrypoint[2438]: OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x00000003dc000000, 16710107136, 0) failed; error='Not enough space' (errno= systemd-entrypoint[2438]: at org.elasticsearch.tools.launchers.JvmOption.flagsFinal(JvmOption.java:119) systemd-entrypoint[2438]: at org.elasticsearch.tools.launchers.JvmOption.findFinalOptions(JvmOption.java:81) systemd-entrypoint[2438]: at org.elasticsearch.tools.launchers.JvmErgonomics.choose(JvmErgonomics.java:38) systemd-entrypoint[2438]: at org.elasticsearch.tools.launchers.JvmOptionsParser.jvmOptions(JvmOptionsParser.java:135) systemd-entrypoint[2438]: at org.elasticsearch.tools.launchers.JvmOptionsParser.main(JvmOptionsParser.java:86) systemd[1]: elasticsearch.service: main process exited, code=exited, status=1/FAILURE systemd[1]: Failed to start Elasticsearch. systemd[1]: Unit elasticsearch.service entered failed state. systemd[1]: elasticsearch.service failed. |
To fix it, edit file
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/etc/elasticsearch/jvm.options |
At end of the file, add
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-Xms1g -Xmx1g |
Restart elasticsearch with
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systemctl restart elasticsearch |
Verify elasticsearch is running with
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systemctl restart elasticsearch curl localhost:9200 |
See elasticsearch […]
To change MySQL root password in Virualmin server, login to virtualmin, navigate to
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Webmin > Servers > MySQL Database Server |
Click on “Change Administration Password” button. On next page, it will show current MySQL root password and provide option to change MySQL root password. See Virtualmin […]
The setfacl utility sets Access Control Lists (ACLs) of files and directories. To install setfacl on Ubuntu/Debian, run
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apt install acl |
Here is an example, where we create 2 users, one user will be given access to folder inside another users home directory.
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useradd -m --shell /bin/bash user1 useradd -m --shell /bin/bash user2 su - user1 mkdir share setfacl -m u:user2:rwx share |
in setfacl, -m option is used to modify. u specify user, if you […]
Install shoutcast server Shoutcast sc trans Start shoutcast on boot CentovaCast Enable SSL for shoutcast […]
cryptsetup is used to encypt disk on Linux. I used TrueCrypt before this. After TrueCrypt stopped the project, i started using cryptsetup for my encrypted drive. To mount an encrypted disk, run
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cryptsetup luksOpen /dev/sda3 sda3_crypt |
Example
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cryptsetup luksOpen /dev/sdb4 enfs1 mount /dev/mapper/enfs1 /mnt/tmp |
See mount […]
After installing elasticsearch on CentOS 7, it failed to start with error
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[root@ns3160182 ~]# systemctl start elasticsearch.service Job for elasticsearch.service failed because the control process exited with error code. See "systemctl status elasticsearch.service" and "journalctl -xe" for details. [root@ns3160182 ~]# [root@ns3160182 ~]# systemctl status elasticsearch.service ● elasticsearch.service - Elasticsearch Loaded: loaded (/usr/lib/systemd/system/elasticsearch.service; enabled; vendor preset: disabled) Active: failed (Result: exit-code) since Sat 2021-03-06 11:10:24 CET; 28s ago Docs: https://www.elastic.co Process: 10234 ExecStart=/usr/share/elasticsearch/bin/systemd-entrypoint -p ${PID_DIR}/elasticsearch.pid --quiet (code=exited, status=1/FAILURE) Main PID: 10234 (code=exited, status=1/FAILURE) CGroup: /system.slice/elasticsearch.service Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:161) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:127) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at org.elasticsearch.cli.Command.main(Command.java:90) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:126) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd[1]: elasticsearch.service: main process exited, code=exited, status=1/FAILURE Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd[1]: Failed to start Elasticsearch. Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd[1]: Unit elasticsearch.service entered failed state. Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd[1]: elasticsearch.service failed. [root@ns3160182 ~]# |
On checking journalctl, i get
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[root@ns3160182 ~]# journalctl -u elasticsearch -- Logs begin at Sat 2021-02-13 16:48:02 CET, end at Sat 2021-03-06 11:12:02 CET. -- Mar 06 11:10:01 ns3160182.ip-151-106-34.eu systemd[1]: Starting Elasticsearch... Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: fatal error in thread [main], exiting Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: java.lang.NoClassDefFoundError: Could not initialize class com.sun.jna.Native Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at org.elasticsearch.systemd.Libsystemd.lambda$static$0(Libsystemd.java:34) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at java.base/java.security.AccessController.doPrivileged(AccessController.java:312) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at org.elasticsearch.systemd.Libsystemd.<clinit>(Libsystemd.java:33) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at org.elasticsearch.systemd.SystemdPlugin.sd_notify(SystemdPlugin.java:126) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at org.elasticsearch.systemd.SystemdPlugin.onNodeStarted(SystemdPlugin.java:137) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at java.base/java.util.ArrayList.forEach(ArrayList.java:1511) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at org.elasticsearch.node.Node.start(Node.java:902) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at org.elasticsearch.bootstrap.Bootstrap.start(Bootstrap.java:317) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:402) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:170) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:161) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:127) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at org.elasticsearch.cli.Command.main(Command.java:90) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:126) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd-entrypoint[10234]: at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd[1]: elasticsearch.service: main process exited, code=exited, status=1/FAILURE Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd[1]: Failed to start Elasticsearch. Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd[1]: Unit elasticsearch.service entered failed state. Mar 06 11:10:24 ns3160182.ip-151-106-34.eu systemd[1]: elasticsearch.service failed. [root@ns3160182 ~]# |
To fix this, edit file
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vi /etc/sysconfig/elasticsearch |
At end of the file, add
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ES_TMPDIR=/var/log/elasticsearch |
Now elasticsearch will start
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systemctl start elasticsearch |
Verify service is running with
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systemctl status elasticsearch |
To confirm elasticsearch is running, use command
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curl localhost:9200 |
See elasticsearch […]
oneinstack is a free hosting management software available at https://oneinstack.com/ Documentation available at https://oneinstack.com/docs/lampstack-image-guide-en/ To find MySQL root password, run
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cd /root/oneinstack grep dbrootpwd options.conf |
Nginx configuration files
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/usr/local/nginx/conf/vhost |
Restart Nginx
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systemctl restart nginx |
See Hosting Control Panels […]