I'm making a migration of my monitoring application from a redhat 6 server to a redhat 7 server. There are perl plugins I have on the redhat 6 server that work. But when migrated to redhat 7, they dont. The package in question here is **perl-DBD-Sybase.x86_64 1.10-1.el6.rf** Im able to install this package on redhat 7 (there doesnt appear to be a redhat 7 version of it - at least, i havent found one). And when I install the package and try to use the plugin that uses the package, I get the following error: [/usr/bin/perl: symbol lookup error: /usr/lib64/perl5/vendor_perl/auto/DBD/Sybase/Sybase.so: undefined symbol: Perl_Istack_sp_ptr] Do i have any other alternative to dealing with this? how can i resolve this so it works on redhat 7?

I am using a computer system with the gnome desktop system, with which I am not able to work properly (resizing of windows does not work etc). Therefore I would like to install the unity-desktop. Is that possible on Redhat (Red Hat Enterprise Linux Workstation release 6.8 (Santiago))? And if so, how? A simple yum install unity did not find anything....

Trying to permanently change some vm kernel parameters, I created /etc/sysctl.d/01-custom.conf config file as it described in Red Hat knowledgebase article. Here is its content: # cat /etc/sysctl.d/01-custom.conf vm.swappiness=10 vm.dirty_ratio=20 vm.vfs_cache_pressure=200 But after reboot only vm.vfs_cache_pressure is changed and swappines and dirty_ratio have previous values. # sysctl vm.swappiness vm.swappiness = 30 # sysctl vm.dirty_ratio vm.dirty_ratio = 30 In /etc/sysctl.conf file there is no changes for vm.dirty_ratio parameter and vm.swappines is set to 10 as well. Does it mean that the system takes these values from somewhere else? There are no any config files under /etc/sysctl.d besides mine and link to /etc/sysctl.conf: # ll /etc/sysctl.d/ total 4 -rw-r--r-- 1 root root 147 May 30 04:40 01-custom.conf lrwxrwxrwx. 1 root root 14 Apr 3 15:00 99-sysctl.conf -> ../sysctl.conf **Update:** sysctl --system shows that values from my config were taken. Nothing for vm.swappines and vm.dirty_ratio are set to 30.

I am building a RHEL8 instance and when installing openssl-devel and python36-devel I get the error > [sss_cache] [sysdb_domain_cache_connect] (0x0010): DB version too old > [0.23], expected [0.24] for domain implicit_files! > > Higher version of database is expected! In order to upgrade the > database, you must run SSSD. > > Removing cache files in /var/lib/sss/db should fix the issue, but note > that removing cache files will also remove all of your cached > credentials. I added *sss_cache -E* before the openssl-devel install step but that didn't help.. I also tried restarting the sssd service and the error still appears every time

Openldap (specifically version 2.4) stores transaction history in log files by default in the ldap data directory (so /var/lib/ldap/log.###########). Currently these log files take up a lot of space, are never removed automatically, and grow infinitely. Manual removal for old logs works fine, but I'd like to limit the amount of logs slapd keeps automatically. # MY SCENARIO # I know that these transaction logs are used to recover ldap in case of a catastrophic failure. In my scenario ldap is regularly wiped and populated via a script (this isn't used for system login accounts). Because of this I don't need to concern myself with recovery, in case of a failure it's acceptable to run the script again. On the other hand, the regular wipe/population of ldap includes a lot of transactions, so these transaction logs build up pretty quickly. # LOGROTATE # logrotate has potential here, but if the most recent transaction log is ever removed then slapd will fail to start (it will complain about needing to perform recovery). Because I can't rely on the log names (because slapd keeps many small logs, incrementing the log file number as it goes) I'd like to use the Berkeley DB settings which creates these logs. I can count on the access/creation dates (most recent modify date is the most recent transaction log), but I'd still prefer to use Berkeley if possible. # DB_CONFIG # The settings for the transactions logs are said to be controlled by the Berkeley DB settings in /var/lib/ldap/DB_CONFIG. The example DB_CONFIG that comes with openldap specifies some transaction log settings: set_lg_regionmax 262144 set_lg_bsize 2097152 According to the Oracle documentation on Berkeley: set_lg_regionmax: Set the size of the underlying logging area of the Berkeley DB environment, in bytes. The log region is used to store filenames, and so may need to be increased in size if a large number of files will be opened and registered with the specified Berkeley DB environment's log manager. So this seems to just set the size of the file that tracks the transaction log files. set_lg_bsize: Set the size of the in-memory log buffer, in bytes. This seems to control how much RAM is allotted to the transaction buffer. The log.########### files in the ldap data directory are all 10485760 bytes which seems to correspond closely to set_lg_bsize (10485760 / 5 = 2097152 = set_lg_bsize) though I'm not sure if this is a coincidence. My interpretation of this is that $lg_bsize amount of transaction history is stored in memory at a time. When this limit is exceeded it pushes some of the transaction history to the most recent log file, and creates a new log if the current log reaches a certain size. # DB_LOG_AUTOREMOVE # According to the Berkeley documentation transaction logs can be removed by setting the flag DB_LOG_AUTOREMOVE in the DB_CONFIG. DB_LOG_AUTOREMOVE: If set, Berkeley DB will automatically remove log files that are no longer needed. However when I added this to the DB_CONFIG: set_flags DB_LOG_AUTOREMOVE and restarted slapd I didn't notice a difference. I removed the old transaction logs and ran the ldap population script that I have, and was able to rack up 290MB in transaction logs. It still doesn't seem to be limiting the logs at all. The reason for this may be related to the phrase: that are no longer needed # Actual Question # How does one configure the automatic removal of slapd's transaction logs using the Berkeley DB DB_CONFIG file?

I need to export proxy on RHEL 7 with the current logged user credentials. I am able to achieve this by adding manually in **.bashrc or .bash_profile.**: export http_proxy=http://username:password@proxy.example.com:6080 export https_proxy=http://username:password@proxy.example.com:6080 The above method works fine. But I don't want this method, since we are hard-coding the username and password and also it's not secure. Is it possible to use the existing **/etc/shadow** file as password for exporting the proxy?

RHEL9 Sometimes server 1 has the secondary address 10.143.170.80/24, and sometimes server 2 has that secondary address. My script needs to test which server has that secondary address. However, ip address show dev ${VirtDev} secondary always returns 0, whether or not the secondary address exists or not. Server 1: ip address show dev $VirtDev secondary echo $? 0 Server 2: ip address show dev $VirtDev secondary 2: ens33: mtu 1500 qdisc mq state UP group default qlen 1000 link/ether 00:50:56:8e:73:35 brd ff:ff:ff:ff:ff:ff altname enp2s1 inet 10.143.170.80/24 scope global secondary ens33:0 valid_lft forever preferred_lft forever echo $? 0 This works, but seems janky: Exists=$(ip address show dev $VirtDev secondary) [ -n "$Exists" ] && echo exists || echo not exists Is there a better way? EDIT: when parsing json... ip -j -4 a ls to 10.143.170.80 | jq -e .[].addr_info [ {}, { "family": "inet", "local": "10.143.170.80", "prefixlen": 24, "scope": "global", "secondary": true, "label": "ens33:0", "valid_life_time": 4294967295, "preferred_life_time": 4294967295 } ] ip -j -4 a ls to 10.143.170.80 | jq -e .[].addr_info.local jq: error (at :1): Cannot index array with string "local"

I'm using a red hat developer subscription, so no official support from red hat. I have a rhel 9.6 installed to a 2TB nvme SSD, whose partitions are as follows: - 1 : 600MB (EFI) - 2 : 1GB (forget what it is, seemed to be a rhel boot-related partition) - 3 : 904.01GB (rhel main partition) - 4 : 200GB (a Windows 11 system partition) - 5 : 200GB - 6 : 557.41GB After I executed `dnf update and reboot` as normal, grub cannot find any of my rhel kernel(including rescue mode). The only thing grub found was Windows boot manager. Then I boot into Windows to check my partitions, finding that all my partitions were fine. So how to find my rhel back? Please help.

so trying to capture history with date and readable timestamps AND the command should appear on same line. following is failing: Bash ver is: GNU bash, version 4.4.20(1)-release (x86_64-redhat-linux-gnu) OS: RHEL 8.x in .bashrc.... setopt EXTENDED_HISTORY export HISTTIMEFORMAT='%F %I:%M:%S %T' #export HISTTIMEFORMAT="%F %T " export HISTSIZE=1000 export HISTFILE=$HOME/.bash_history-$USER export HISTFILESIZE=1000 export PROMPT_COMMAND='history -a' env variables: $ env|grep HIST HISTCONTROL=ignoredups HISTTIMEFORMAT=%F %I:%M:%S %T HISTFILE=/home/user1/.bash_history-user1 HISTSIZE=1000 HISTFILESIZE=1000 the records appear as: #1753745611 cd #1753745616 ls -ltra|tail #1753745626 cat .profile #1753745633 cat .kshrc **expected:** Mon Jul 28 23:33:31 GMT 2025 cd Mon Jul 28 23:33:36 GMT 2025 ls -ltra|tail Mon Jul 28 23:33:46 GMT 2025 cat .profile Mon Jul 28 23:33:53 GMT 2025 cat .kshrc two problems with this. 1. Timestamp appears in UNIX EPOCH format. 2. Timestamp and command appears on separate lines. They should be together. Also behaves the same way when using KSH. How can this be fixed? preferably using HISTTIMEFORMAT Thank you.

I have a Dell PowerEdge R740 server with an Intel Corporation Ethernet Controller x710 for 10GbE SFP+ network interface. I have installed RHEL 8 on it. I am trying to enable UDP Fragmentation Offload (UFO): $ sudo ethtool --offload eno1 ufo on I get this message:

Cannot change UDP fragmentation offload  
Cannot change any device features.

eno1 has SFP+ DAC cable. Is the issue because of SFP+ cable? or any driver that I might be missing?

With a netcat listener like: nc -l / > ~/.bashrc My question is: Is there a way to mimic the capabilities of nc -l in my first line with /dev/tcp instead of nc? The machines I'm working on are extremely hardened lab/sandbox environment RHEL (no ssh, no nc, no LDAP, no yum, I can't install new software, and they are not connected to the internet)

> **What specific syntax needs to be changed or added to the below in order for commands calling python in a RHEL7 VM to be interpreted using Python3 WITHOUT breaking programs like yum that require Python2?** **FIRST ATTEMPT:** Our first attempt was to add the following 2 lines to the very end of the cloud-init startup script which instantiates the VM: rm /usr/bin/python ln -s /usr/bin/python3 /usr/bin/python **ERROR THAT RESULTED:** The problem is that adding the above two lines to the end of the cloud-init startup script causes yum commands to break when yum is called afterwards as follows: $ sudo yum update -y File "/bin/yum", line 30 except KeyboardInterrupt, e: ^ SyntaxError: invalid syntax $ **TOGGLING THE ERROR:** We can turn off the error by removing the above 2 lines from the cloud-init startup script and re-instantiating a new replacement VM. This isolates the source of the problem, but still we have the problem of how to default python to Python3 without breaking apps like yum.

How a protected package can be removed using microdnf package manager? When running docker container almalinux/9-minimal (or redhat/ubi9-minimal) like

podman run -it --rm almalinux/9-minimal

and inside the container

microdnf install -y dnf && microdnf remove -y dnf

the latter command fails with

error: Could not depsolve transaction; 1 problem detected:
 Problem: The operation would result in removing the following protected packages: dnf

I am trying to run a program on a computer running Red Hat 6.5. This results in the three following errors: "/lib64/libc.so.6: version `GLIBC_2.14' not found" "/usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.15' not found" "/lib64/libm.so.6: version `GLIBC_2.15' not found" Clearly I have to install those libraries, but when searching I only found solutions that suggest running "sudo apt-get", which I sadly can't (no sudo access). Thus I need a solution to install them without sudo. (EDIT: This system does not have apt-get, but I am under the impression that yum, which it does have, is not far from the same thing. Still requires root though). Additionally, I would prefer if the solution only affected my account, or even were limited to the program I am trying to run, so I don't affect other users on this system. I would appreciate if I could receive some help on how to achieve something like this, or if it is impossible, I would like to know that (and out of curiosity, maybe also why).

There is a proprietary document about system hardening/security standard stating that group users, nogroup, other, and some other groups should not contain any user except system administrators. I've found an explanation about nogroup group [here](https://unix.stackexchange.com/questions/22520/what-is-nogroup-groups-purpose) . What about the users and other groups and what are they for? Why regular (non-administrator) users should not be member of these groups? Distro is, RHEL (Red Hat Enterprise Linux)

When trying to run

tc qdisc add dev $INTERFACE root handle 1: prio priomap 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
   tc qdisc add dev $INTERFACE parent 1:1 handle 10: netem loss "${LOSS}"%

I get the error of Specified qdisc not found yum -y install kernel-modules-extra works as a fix, but requires a reboot. In my case, a reboot is not an option Is there a way around a reboot to get qdisk working? RHEL 8.6

We know that if we give --progress parameter to rsync it will show the progress of files copied. But issue is that is shows the progress for each single file not total or overall progress. So how to see the Total progress of files copied.

I'm new at Linux and I will get use of your help guys on this.. I want to increase the size of /tmp directory without affecting RAM or anything else on Red Hat 8.2 .. any suggestions to do that? Thanks!

I have **/home/myuser/Desktop/rc/.netrc** file that i want hardlink to **/root**, ie home directory of **root** user. When i do: ln /home/user/Destkop/rc/.netrc /root it gives the following error: > ln: creating hard link /root/.netrc' => .netrc': Invalid > cross-device link but it works when i hardlink the file to **myuser**'s home, ie to **/home/myuser**. So, what's the problem, why it says invalid cross-devices when there is only one file system here? **PS.** I am using **RHEL6**

I'm running RHEL 8, and occasionally, I get an issue where the authentication window won't accept my password. I know I am entering it correctly because it is the same password I use to log in to the system. Checked /var/log/secure but didn't see anything useful. Could it be related to pam.d?