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La distribuzione CentOS Linux è una piattaforma stabile derivata dalle fonti di Red Hat Enterprise Linux (RHEL). 

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8 /8-Stream / 9-Stream - General Support • Re: Centos Stream 9 shutdown issue

On bugzilla, all bug entries raised against the 'kernel' component were automatically made private to avoid disclosure of private information in any attached files. I would suspect the same is true of the new JIRA so permission denied is not impossible though I would expect the issue creator to be able to read their own bug.

Statistics: Posted by TrevorH — 2023/09/12 21:33:46

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CentOS

CentOS 7 - Networking Support • Re: Using Zones in Firewalld to Block Outbound Access

Is there any side effect of leaving the state of the firewalld.service as it is?
Do show output of systemctl status firewalld

A masked service points to /dev/null and cannot possibly start. A merely disabled service -- not masked -- could be started by some other process.

Statistics: Posted by jlehtone — 2023/09/13 14:45:36

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CentOS

CentOS 7 - Networking Support • Re: Using Zones in Firewalld to Block Outbound Access

I don't see the point in leaving firewall* packages installed if you have switched to using iptables or nftables. It just creates confusion for anyone that comes along later and has to work out what's in use.

I'd just yum remove firewall\* and then read what it says it's going to do before replying Y.

Statistics: Posted by TrevorH — 2023/09/13 16:09:17

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CentOS

CentOS 7 - Networking Support • Re: Using Zones in Firewalld to Block Outbound Access

Is there any side effect of leaving the state of the firewalld.service as it is?
Do show output of systemctl status firewalld

CODE: 

# systemctl status firewalld● firewalld.service   Loaded: masked (/dev/null; bad)   Active: inactive (dead)Sep 13 22:24:17 centos7-server systemd[1]: Cannot add dependency job f....Sep 13 22:24:17 centos7-server systemd[1]: Cannot add dependency job f....Sep 13 22:24:17 centos7-server systemd[1]: Cannot add dependency job f....Sep 13 22:24:17 centos7-server systemd[1]: Cannot add dependency job f....Sep 13 22:24:17 centos7-server systemd[1]: Cannot add dependency job f....Sep 13 22:24:17 centos7-server systemd[1]: Cannot add dependency job f....Sep 13 22:24:18 centos7-server systemd[1]: Cannot add dependency job f....Sep 13 22:24:18 centos7-server systemd[1]: Cannot add dependency job f....Sep 13 22:24:20 centos7-server systemd[1]: Cannot add dependency job f....Sep 13 22:36:37 centos7-server systemd[1]: Cannot add dependency job f....Warning: firewalld.service changed on disk. Run 'systemctl daemon-reload' to reload units.Hint: Some lines were ellipsized, use -l to show in full.

Statistics: Posted by yildizabdullah — 2023/09/13 19:38:20

Distro
CentOS

CentOS 7 - Networking Support • Re: Using Zones in Firewalld to Block Outbound Access

You could run that systemctl daemon-reload as the output suggests.

The firewalld.service seems to be masked, so everything should be ok.


I do agree with Trevor that complete removal of FirewallD is the most clean option.

The removal of firewall* on CentOS 7 system probably removes:
firewall-applet, firewall-config, firewalld, firewalld-filesystem
and packages that require those, e.g.
anaconda-core, anaconda-gui, anaconda-tui, initial-setup, initial-setup-gui

The anaconda and initial-setup were used only on initial install of the system, so it should be ok to remove the firewalld.
Unless in your system some more important packages would get removed ...

Statistics: Posted by jlehtone — 2023/09/14 06:53:05

Distro
CentOS

CentOS 7 - Networking Support • My web server is slow

Hello,
My server has 6 GM RAM and 4 virtual CPUs. This server hosts a WordPress website. I checked some parts of the server as follows:

CODE: 

# free              total        used        free      shared  buff/cache   availableMem:        5924976     1726272     2069744      353176     2128960     3547828Swap:       2097148           0     2097148
And:

CODE: 

# df -ihFilesystem              Inodes IUsed IFree IUse% Mounted ondevtmpfs                  721K   378  721K    1% /devtmpfs                     724K     1  724K    1% /dev/shmtmpfs                     724K  1.5K  722K    1% /runtmpfs                     724K    16  724K    1% /sys/fs/cgroup/dev/mapper/centos-root    16M  952K   15M    7% //dev/sda2                  64K    53   64K    1% /boot/dev/sda1                    0     0     0     - /boot/efi/dev/loop0                256K    27  256K    1% /tmptmpfs                     724K     1  724K    1% /run/user/0
And:

CODE: 

# iostat -x 5Linux 3.10.0-1160.88.1.el7.x86_64 (MyServer.CloudServer.com)     09/13/2023     _x86_64_    (4 CPU)avg-cpu:  %user   %nice %system %iowait  %steal   %idle          15.54    0.04    5.15    0.34    0.00   78.93Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %utilsda               0.15     7.17    7.37    6.26   113.33   492.67    88.92     0.34   24.72   23.86   25.73   0.83   1.13dm-0              0.00     0.00    7.05   12.54   111.32   489.09    61.29     0.36   18.18   33.61    9.51   0.58   1.13dm-1              0.00     0.00    0.48    0.89     1.94     3.55     8.02     2.66 1937.14   53.13 2960.46   1.51   0.21
And:

CODE: 

# mpstat -P ALL 5Linux 3.10.0-1160.88.1.el7.x86_64 (MyServer.CloudServer.com)     09/13/2023     _x86_64_    (4 CPU)02:46:44 PM  CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal  %guest  %gnice   %idle02:46:49 PM  all    2.42    0.00    1.56    0.05    0.00    0.10    0.00    0.00    0.00   95.8702:46:49 PM    0    1.61    0.00    2.21    0.00    0.00    0.00    0.00    0.00    0.00   96.1802:46:49 PM    1    7.23    0.00    3.41    0.00    0.00    0.20    0.00    0.00    0.00   89.1602:46:49 PM    2    0.20    0.00    0.20    0.00    0.00    0.20    0.00    0.00    0.00   99.3902:46:49 PM    3    0.40    0.00    0.60    0.20    0.00    0.00    0.00    0.00    0.00   98.80
And:

CODE: 

# iostat -xd -k 2 5 or iostat -pLinux 3.10.0-1160.88.1.el7.x86_64 (MyServer.CloudServer.com)     09/13/2023     _x86_64_    (4 CPU)Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %utilsda               0.15     7.17    7.37    6.26   113.31   492.59    88.91     0.34   24.72   23.86   25.73   0.83   1.13sda1              0.00     0.00    0.00    0.00     0.01     0.00    31.68     0.00    0.77    0.65    2.60   0.51   0.00sda2              0.00     0.00    0.00    0.00     0.05     0.04   182.07     0.00    7.87    8.52    5.77   5.69   0.00sda3              0.13     6.76    0.99    2.94    23.29    56.14    40.42     0.16   40.14   45.31   38.39   1.27   0.50sda4              0.02     0.39    6.05    2.06    73.87    88.20    39.97     0.10   12.65   13.23   10.95   0.97   0.79sda5              0.00     0.01    0.32    1.27    16.08   348.21   459.38     0.08   48.23  159.59   20.33   2.13   0.34scd0              0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00dm-0              0.00     0.00    7.05   12.54   111.30   489.00    61.28     0.36   18.18   33.61    9.51   0.58   1.13dm-1              0.00     0.00    0.48    0.89     1.94     3.55     8.02     2.66 1937.14   53.13 2960.46   1.51   0.21loop0             0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00
And:

CODE: 

# pidstat 5Linux 3.10.0-1160.88.1.el7.x86_64 (MyServer.CloudServer.com)     09/13/2023     _x86_64_    (4 CPU)02:49:31 PM   UID       PID    %usr %system  %guest    %CPU   CPU  Command02:49:36 PM     0         9    0.00    0.80    0.00    0.80     2  rcu_sched02:49:36 PM    99     30344    0.40    0.40    0.00    0.80     0  httpd02:49:36 PM     0     33184    0.20    0.60    0.00    0.80     3  pidstat02:49:36 PM     0     64839    0.20    0.20    0.00    0.40     3  cspfwd02:49:36 PM    27     69539    3.78   14.74    0.00   18.53     2  mysqld02:49:36 PM     0    120682    1.20    0.20    0.00    1.39     1  python302:49:36 PM     0    121404    0.00    0.20    0.00    0.20     2  imunify360-php-02:49:36 PM     0    121464    0.00    0.20    0.00    0.20     2  imunify-auditd-02:49:36 PM     0    121574    0.20    0.60    0.00    0.80     3  imunify360-unif02:49:36 PM     0    126016    0.00    0.20    0.00    0.20     2  kworker/2:0
And:

CODE: 

# ps -e -o pcpu,nice,state,cputime,args --sort -pcpu | head -10%CPU  NI S TIME     COMMAND12.7   0 S 11:50:13 /usr/sbin/mysqld 1.4   0 S 00:01:46 /usr/sbin/imunify360-unified-access-logger 1.2   0 S 00:01:38 /opt/imunify360/venv/bin/python3 -m im360.run 0.7   0 S 00:15:22 /usr/sbin/pam_imunify_daemon.bin 0.6   0 S 01:41:24 [rcu_sched] 0.3   0 S 00:00:01 /usr/sbin/httpd -k start 0.3   0 S 00:00:25 /usr/sbin/imunify-realtime-av 0.2   0 S 00:00:01 /usr/sbin/httpd -k start 0.1   0 S 00:15:11 /usr/lib/systemd/systemd --switched-root --system --deserialize 22
The MySQL configuration is:

CODE: 

[mysqld]performance_schema           = 0show_compatibility_56        = 1datadir                      = /var/lib/mysqlsocket                       = /var/lib/mysql/mysql.sockslow-query_log_file          = /var/log/mysql-slow.loglog-error                    = /var/log/mysqld.logmax_allowed_packet=268435456default_storage_engine         = InnoDBmax_connections                = 151max_user_connections           = 50thread_cache_size              = 151query_cache_type               = 1query_cache_size               = 64Msort_buffer_size               = 2Mtmp_table_size                 = 32Mread_buffer_size               = 128kread_rnd_buffer_size           = 256kjoin_buffer_size               = 128ktable_definition_cache         = 400table_open_cache               = 400slow_query_log_file            = slow.logslow_query_log                 = 0log_queries_not_using_indexes  = 1long_query_time                = 0.5min_examined_row_limit         = 100max_heap_table_size            = 64Minnodb_buffer_pool_size        = 10Minnodb_file_per_table          = 1innodb_flush_log_at_trx_commit = 2innodb_log_buffer_size         = 8Minnodb_log_file_size           = 100Mlog_binexpire_logs_days               = 7
And the important part of Apache is as follows:

CODE: 

Timeout 45KeepAlive OnMaxKeepAliveRequests 100KeepAliveTimeout 15<IfModule mpm_prefork_module>StartServers        3MinSpareServers     3MaxSpareServers     3ServerLimit         50MaxClients          50MaxRequestsPerChild 1000</IfModule><IfModule mpm_worker_module>StartServers        3MaxClients          50MinSpareThreads     3MaxSpareThreads     3 ThreadsPerChild     25MaxRequestsPerChild 1000</IfModule>
It is not only the website that is slow, but also the system itself. MySQL seems to use more memory and CPU than other processes. What other parts should I check?

Thank you.

Statistics: Posted by hack3rcon — 2023/09/14 11:35:07

Distro
CentOS
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