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    CentOS / RHEL 7 : Install and Configure SNMPv3

    CentOS / RHEL 7 : Install and Configure SNMPv3

    Please find below Steps to configure SNMPv3.

    1. Install the required packages

    # yum install net-snmp net-snmp-utils net-snmp-devel -y

    2. Create User

    Turn off the agent  the snmpd agent.

    # systemctl stop snmpd

    There are Three ways you can create the user.
    1. CLI Mode
    2. Interactive Mode
    3. Manually

    1. CLI mode
    The syntax of "net-snmp-config –create-snmp3-user" is as below :

    net-snmp-config --create-snmpv3-user [-ro] [-A authpass] [-X privpass] [-a MD5|SHA] [-x DES|AES] [username]
    Default authentication method is MD5 and default encryption is DES if not explicitly specified.

    # net-snmp-config --create-snmpv3-user -a MD5 -A testsnmp123 testsnmp

    2. Interactive Mode
    You can also use interactive mode to enter username and password as follows :

    # net-snmp-create-v3-user

    Enter a SNMPv3 user name to create:
    Enter authentication pass-phrase:
    Enter encryption pass-phrase:
    [press return to reuse the authentication pass-phrase]

    adding the following line to /var/lib/net-snmp/snmpd.conf:
    createUser testsnmp MD5 "testsnmp123" DES
    adding the following line to /etc/snmp/snmpd.conf:
    rwuser testsnmp

    3. Manual
    To manually add the user – add below line to the file /var/lib/net-snmp/snmpd.conf :

    createUser testsnmp MD5 "testsnmp123" DES

    and add below lines to the file /etc/snmp/snmpd.conf

    rwuser testsnmp
    The sample username is testsnmp and pass-phrase is testsnmp123.

    3. Start the service
    Configure the SNMP services to start on each reboot :

    # systemctl enable snmpd

    Start the snmpd service :

    # systemctl start snmpd

    4. Test the setup using snmpwalk command

    # snmpwalk -v3 -u testsnmp -l authNoPriv -a MD5 -A testsnmp123 localhost

    -v3 - specifies version
    -u - specifies username
    -l - specifies security level
    -a - specifies Authentication Protocol
    -A - specifies Pass-phrase

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