First, all the problems
Xshell not connect
Type error: Could not connect to '192.168.122.1' (port 22): Connection failed.
The reason: IP address is not generated
solutions: Rebuild the ip address of the service network restart, -a view after the virtual machine inet IP in ifconfig
Xshell upload files to the server: rz
Xshell download files from the server: rz filename
Unzip the file
tar -zxvf filename.tar.gz # extract to the current directory, retain the original file
tar -zxvf filename.tar.gz -C dir # dir extract to a directory, retain the original file
compressed tar czvf kernel.tgz linux-2.6.29
When the execution is not enough to create or delete user permissions centos
the root SU
chown -R & lt HK: HK / the dir
(LL / usr see the results, the increase in the permission / usr)
Due to the above operation results in under / usr root privileges instead of the user group, reported the following error
[hk@hk ~]$ sudo root passwd sudo: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set [hk@hk ~]$ su root Password: su: Authentication failure
Solution:
1, to switch to the root user permissions back, chown root: root / usr / -R & lt *
2, the root user performs
the chmod + U S / usr / bin / the sudo
the chmod + U S / usr / bin / su
vim command
to delete all content gg dG
Port number 27017 is occupied reported 48 errors
Failed to set up listener: SocketException: Address already in use
Solution:
lsof -i :27017 #pid
kill - 9 pid
Second, install and run
Install version MongoDB 4.0, the official website to download
cd /usr/local tar -zxvf mongodb-linux-x86_64-4.0.0.tgz mkdir mongodb mv mongodb-linux-x86_64-4.0.0/* mongodb rm -rf mongodb-linux-x86_64-4.0.0.tgz rm -rf mongodb-linux-x86_64-4.0.0 cd mongodb mkdir db mkdir logs touch logs/mongodb.log cd /usr/local/mongodb touch mongodb.conf
Modify the startup file: vim mongodb.conf
port = 27017 # port bind_ip = 0.0.0.0 # default is 127.0.0.1 dbpath = / usr / local / MongoDB / db # database storage logpath = / usr / local / mongodb / logs / mongodb.log # log file fork = true # set the background # auth = true # authentication open
Add mongodb environment variables : vim / etc / profile
export MONGODB_HOME=/usr/local/mongodb export PATH=$PATH:$MONGODB_HOME/bin
To save the modified reboot the system configuration , execute the command: source / etc / profile
Run to start the database
/usr/local/mongodb/bin/mongod --config /usr/local/mongodb/mongodb.conf
Boot from the start
vim /etc/rc.d/rc.local /usr/local/mongodb/bin/mongod --config /usr/local/mongodb/mongodb.conf
Firewall settings
vim /etc/sysconfig/iptables -A INPUT -p tcp -m state --state NEW -m tcp --dport 27017 -j ACCEPT systemctl start iptables.service
Firewall setup error:
The service command supports only basic LSB actions (start, stop, restart, try-restart, reload, force-reload, status). For other actions, please try to use systemctl.Close firewalld:
STOP firewalld systemctl systemctl mask firewalld yum the install iptables-Services # open port 443 (the HTTPS) iptables -A --dport the INPUT -p TCP -j ACCEPT 443 # stores the rule -Service iptables Save # open service systemctl the restart iptables.service systemctl enable iptables iptables restart systemctl Service iptables the Save
Access the database : Run mongo normal operation or a warning message will be reported in the bin directory
Error Analysis:
WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.We suggest setting it to 'never'
WARNING: Access control is not enabled for the database. Read and write access to data and configuration is unrestricted.
WARNING: You are running this process as the root user, which is not recommended.
1, / etc / rc.local file settings (transparent_hugepage) problems, according to the relevant specific online methods to try, or reported as a warning. Does not affect the use, temporarily did not go to the scrutiny.
2, the configuration file mongodb.conf auth certified open.
3, does not recommend the use of root user.