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34752 discussions

07 Jan '19

I recently updated docker to version 18.09 and I seem to have lost the container id in the command prompt when I exec into a running container, a very useful feature in the previous version I was running. I have not found any information in the Docker General Forum. Has anyone else seen this?

2 6

Mail server with both postfix and sendmail installed, active MTA gets switched.
by Lamar Owen 05 Jan '19

05 Jan '19

Ok, so a bit of a long subject line there... I'm running an email server using postfix, but a critical third-party package being used requires 'sendmail' the package. No, I can't uninstall that package, please don't suggest that, and I don't have control of its requires. So both postfix and sendmail are installed, and that's just the way it has to be. Amavisd-new and clamav/clamd, from EPEL are also installed. I have had updates twice now switch the active MTA to sendmail, and I have to manually 'systemctl disable sendmail; systemctl stop sendmail' and 'systemctl enable postfix;systemctl start postfix' afterwards. I am trying to find out what package update caused this to switch; or which logfile to look at to show me the systemctl messages that show the enable/disable sequence and points me to the correct package to file the bug against. The packages updated today when this happened were: # cat /var/log/yum.log Jan 04 16:42:47 Updated: clamav-filesystem-0.101.0-1.el7.noarch Jan 04 16:42:48 Updated: clamav-lib-0.101.0-1.el7.x86_64 Jan 04 16:42:48 Updated: clamav-update-0.101.0-1.el7.x86_64 Jan 04 16:42:48 Updated: clamd-0.101.0-1.el7.x86_64 Jan 04 16:42:48 Updated: clamav-server-systemd-0.101.0-1.el7.x86_64 Jan 04 16:42:48 Updated: clamav-scanner-systemd-0.101.0-1.el7.x86_64 Jan 04 16:42:49 Updated: clamav-0.101.0-1.el7.x86_64 Jan 04 16:42:54 Updated: clamav-data-0.101.0-1.el7.noarch Jan 04 16:42:55 Updated: python2-certbot-apache-0.29.1-1.el7.noarch # Sendmail hasn't had updated packages in a long time, since August 2017. None of the package scriptlets from the above packages look like they would affect the sendmail setup. So, I'm looking for suggestions on where to start looking for the data to ferret this out; no clues are in /var/log/messages or /var/log/yum.log.

2 2

thunderbird & firefox
by mark 04 Jan '19

04 Jan '19

I *really* dislike the new photon UI. I WANT the arrow buttons top and bottom of the scrollbars. Does anyone know how to bring them back, or is that "that's *sooo* last year, you can't ever have them again"? mark

4 5

How to troubleshoot partial shutdown problem?
by Marko Vojinovic 04 Jan '19

04 Jan '19

Hi folks, I've never encountered the following problem before (but I guess there is a first time for everything) --- after issuing a regular shutdown, the system starts the shutdown procedure, but stalls at some point, and never finishes. It gets to the console, writes the "powering down" message and stops there --- the hardware never actually powers off. At that time, the machine is completely unresponsive to anything, I have to hold the power button for 5 seconds to actually force it to turn off. This is a clean install of C7, fully updated. I doubt that hardware is at fault, since it *does* properly shut down when I boot it from the C7 live usb (which was used to install the system in the first place). The only difference is that the live usb is not updated at all, while the os on the hard drive has received cca 1000 updates after initial installation. So I'm guessing that something in the updates broke something in the shutdown procedure. Btw, rebooting the machine works properly, no issues. How am I to troubleshoot this? Most importantly, what is the best way to check (after the power cycle) if the hard drive had been unmounted properly during the previous shutdown, i.e. if the unmounting finished before the stall? I don't want the hard drive to "suffer" from unclean shutdowns, if possible. Also, what piece of code prints the "powering off" message in the console (since that appears to be the last thing working)? What else to look for, and where? Is this maybe a known issue, is there a fix? Other than shutting down, the machine works completely ok, so arguably this is not such a big problem (as I plan to have it running 24/7), but still, failing to shutdown when I want it to feels somewhat disturbing, I'd rather have that fixed. Any suggestions? Best, :-) Marko P.S. Happy new year to everyone! ;-)

3 3

OT: but if anyone here knows...
by Fred Smith 04 Jan '19

04 Jan '19

I know this is offtopic, but I hope someone here can give me some guidance. I'm attempting to build sleepyhead (not even on Centos, so it is really OT) and I hit this error: Project ERROR: Unknown module(s) in QT: help Makefile:44: recipe for target 'sub-sleepyhead-make_first-ordered' failed make: *** [sub-sleepyhead-make_first-ordered] Error 3 I don't know anything about using QT, and I've spent hours trying to find a solution to this. there is a qt5help module and it is installed, and I haven't been smart enough to figure out what else this needs. thanks in advance! -- ---- Fred Smith -- fredex(a)fcshome.stoneham.ma.us ----------------------------- But God demonstrates his own love for us in this: While we were still sinners, Christ died for us. ------------------------------- Romans 5:8 (niv) ------------------------------

1 0

Measure system resources consumptions by ClamAV File scanner
by Kaushal Shriyan 03 Jan '19

03 Jan '19

Hi, I am running ClamAV process which is invoked by Cron scheduler around 3:00 AM ( Midnight) on remote server running CentOS Linux release 7.6.1810 (Core). Is there a way to measure what was the system resources consumptions like CPU, Network, I/O, Memory and Computing load is being used and is it possible to find out how much time it took to complete the scan? Any help will be highly appreciated. Thanks in Advance. Best Regards, Kaushal

2 1

install AWX without docker
by Ralf Prengel 03 Jan '19

03 Jan '19

Hallo, I want to use awx without docker for the moment and found this tutorial: https://www.howtoforge.com/tutorial/centos-ansible-awx-installation/ Are there any other docs available? Thanks for hints Ralf Von meinem iPad gesendet

2 2

Erratic local hostname resolution with Dnsmasq
by Nicolas Kovacs 03 Jan '19

03 Jan '19

Hi, My local server is running CentOS 7. The machine has two NICs and is acting as a gateway. For DHCP and DNS, I'm using Dnsmasq. I have a strange little problem with local hostname resolution. Before going into more details, here's my configuration. [root@nestor:~] # ifconfig enp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.0.2 netmask 255.255.255.0 broadcast 192.168.0.255 ether 2c:27:d7:15:54:a1 txqueuelen 1000 (Ethernet) RX packets 17122 bytes 17596130 (16.7 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 13426 bytes 2144915 (2.0 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 18 memory 0xfe8e0000-fe900000 enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.2.1 netmask 255.255.255.0 broadcast 192.168.2.255 ether 00:22:64:8a:4c:c2 txqueuelen 1000 (Ethernet) RX packets 6597320 bytes 9692134059 (9.0 GiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 534283 bytes 57365155 (54.7 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 16 memory 0xfe9e0000-fea00000 [root@nestor:~] # cat /etc/hostname nestor [root@nestor:~] # cat /etc/hosts # /etc/hosts 127.0.0.1 localhost.localdomain localhost 192.168.2.1 nestor.microlinux.lan nestor 192.168.2.252 hp-officejet.microlinux.lan hp-officejet 192.168.2.253 nas.microlinux.lan nas 192.168.2.254 wifi.microlinux.lan wifi [root@nestor:~] # cat /etc/resolv.conf # /etc/resolv.conf nameserver 127.0.0.1 [root@nestor:~] # cat /etc/dnsmasq.conf # /etc/dnsmasq.conf domain-needed bogus-priv interface=enp3s0 dhcp-range=192.168.2.100,192.168.2.200,24h local=/microlinux.lan/ domain=microlinux.lan expand-hosts # Cloudflare server=1.1.1.1 server=1.0.0.1 # Google #server=8.8.8.8 #server=8.8.4.4 no-resolv # Google dhcp-host=D4:85:64:B2:B2:1B,alphamule,192.168.2.2 dhcp-host=00:1E:C9:43:A7:BF,bernadette,192.168.2.3 dhcp-host=00:1D:09:15:4A:D8,raymonde,192.168.2.4 dhcp-host=00:1E:C9:42:84:7B,amandine,192.168.2.5 dhcp-host=B8:CA:3A:D6:5A:43,1C:3E:84:32:7E:87,buzz,192.168.2.6 dhcp-host=90:E6:BA:CF:04:8F,64:70:02:9A:AC:93,balthazar,192.168.2.7 dhcp-host=08:00:27:00:00:01,centosbox,192.168.2.10 dhcp-host=08:00:27:00:00:02,susebox,192.168.2.11 dhcp-host=10:62:E5:D4:95:60,hp-officejet,192.168.2.252 dhcp-host=00:11:32:26:63:A5,nas,192.168.2.253 Now here's the problem. Some of the hostname are correctly resolved, while others are not. Here's what it looks like when invoked from the server. [root@nestor:~] # host alphamule alphamule has address 192.168.2.2 [root@nestor:~] # host bernadette bernadette has address 192.168.2.3 [root@nestor:~] # host raymonde Host raymonde not found: 3(NXDOMAIN) [root@nestor:~] # host amandine Host amandine not found: 3(NXDOMAIN) [root@nestor:~] # host buzz [root@nestor:~] # host balthazar balthazar has address 192.168.2.7 [root@nestor:~] # host centosbox Host centosbox not found: 3(NXDOMAIN) [root@nestor:~] # host susebox Host susebox not found: 3(NXDOMAIN) [root@nestor:~] # host hp-officejet hp-officejet has address 192.168.2.252 [root@nestor:~] # host nas nas has address 192.168.2.253 Of course I could add all these hosts to /etc/hosts, but as far as I understand, this *should* work with the hosts appearing only in /etc/dnsmasq.conf. Or have I overlooked something ? Any suggestions ? Cheers & happy new year, Niki -- Microlinux - Solutions informatiques durables 7, place de l'église - 30730 Montpezat Site : https://www.microlinux.fr Blog : https://blog.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32

2 2

upg. CentOS 7.5 to 7.6: unable to mount smb shares - samba NT domain member using ldap
by Miroslav Geisselreiter 02 Jan '19

02 Jan '19

Originally I posted this question at CentOS forum 20.12.2018. https://www.centos.org/forums/viewtopic.php?f=48&t=69193 Hi all, I am not able to mount samba shares after upgrading CentOS 7.5 to 7.6. I have been searching and trying to configure samba and winbind but no success. I find a lot of manuals and help pages about setting samba and winbind for machine acting as AD DC member but almost nothing about machine acting as NT4 style DC member and that is my case. Samba version before upgrade: samba-4.7.1-9.el7_5.x86_64, after upgrade: samba-4.8.3-4.el7.x86_64. I noticed that now it is necessary to use winbind which I did not use before upgrade. My network: Machine with CentOS 6.9 is PDC (NT4 style) configured with ldap and kerberos, providing domain logon services to Windows and Samba clients of an NT4-like domain. openldap-2.4.40-16.el6.x86_64, krb5-server-1.10.3-65.el6.x86_64, samba-3.6.23-51.el6.x86_64. Machine with CentOS 7.6 is domain member offering network shares to windows clients. Before upgrade my samba-4.7 run only smb and nmb services and everything were fine. After upgrade samba-4.8.3 runs smb nmb and winbind services. smb.conf: workgroup = NT4DOMAIN netbios name = NT4MEMBER |# wbinfo -m --verbose Domain Name DNS Domain Trust Type Transitive In Out BUILTIN Local NT4MEMBER Local NT4DOMAIN INTRANET.XX Workstation Yes No Yes # wbinfo --own-domain NT4DOMAIN | I discovered that winbind is not authenticating users with NT4DOMAIN but only with NT4MEMBER. In this case NT4MEMBER users ARE NT4DOMAIN users (there is only one user1 in ldap database). It can be seen in logs bellow. I set debug level 3 for smbd and winbindd. Windows machines have joined NT4DOMAIN but now cannot mount shares from NT4MEMBER. Windows mount command net use /user:NT4DOMAIN\user1 \\NT4MEMBER\share1 is equal to linux command smbclient //NT4MEMBER/share1 -U NT4DOMAIN\\user1. From linux machine I can mount share by this command: smbclient //NT4MEMBER/share1 -U NT4MEMBER\\user1 but from windows machine it is not possible. Normally (before upgrade) Windows users mapped shares from startup script with this command: net use \\NT4MEMBER\share1. What is going wrong can be seen from logs: |# smbclient //NT4MEMBER/share1 -U NT4DOMAIN\\user1 smbd log: check_ntlm_password: Checking password for unmapped user [NT4DOMAIN]\[user1]@[NT4MEMBER] with the new password interface check_ntlm_password: mapped user is: [NT4DOMAIN]\[user1]@[NT4MEMBER] check_ntlm_password: Authentication for user [user1] -> [user1] FAILED with error NT_STATUS_NO_MEMORY, authoritative=1 Auth: [SMB2,(null)] user [NT4DOMAIN]\[user1] at [Wed, 19 Dec 2018 13:56:08.989053 CET] with [NTLMv2] status [NT_STATUS_NO_MEMORY] workstation [NT4MEMBER] remote host [ipv4:X.X.X.X:40488] mapped to [NT4DOMAIN]\[user1]. local host [ipv4:X.X.X.X:445] log_no_json: JSON auth logs not available unless compiled with jansson gensec_spnego_server_negTokenTarg_step: SPNEGO(ntlmssp) login failed: NT_STATUS_NO_MEMORY smbd_smb2_request_error_ex: smbd_smb2_request_error_ex: idx[1] status[NT_STATUS_NO_MEMORY] || at ../source3/smbd/smb2_sesssetup.c:137 Server exit (NT_STATUS_END_OF_FILE) Terminated winbind log: [ 9232]: request interface version (version = 30) [ 9232]: request location of privileged pipe [ 9232]: pam auth crap domain: [NT4DOMAIN] user: user1 set_dc_type_and_flags_connect: DC for domain NT4DOMAIN claimed it was a DC for domain NT4MEMBER, refusing to initialize [ 9228]: pam auth crap domain: NT4DOMAIN user: user1 set_dc_type_and_flags_connect: DC for domain NT4DOMAIN claimed it was a DC for domain NT4MEMBER, refusing to initialize set_dc_type_and_flags_connect: DC for domain NT4DOMAIN claimed it was a DC for domain NT4MEMBER, refusing to initialize ldb_wrap open of secrets.ldb rpccli_create_netlogon_creds failed for NT4DOMAIN, unable to create NETLOGON credentials: NT_STATUS_NO_MEMORY Could not open handle to NETLOGON pipe (error: NT_STATUS_NO_MEMORY, attempts: 0) The connection to netlogon failed, retrying set_dc_type_and_flags_connect: DC for domain NT4DOMAIN claimed it was a DC for domain NT4MEMBER, refusing to initialize set_dc_type_and_flags_connect: DC for domain NT4DOMAIN claimed it was a DC for domain NT4MEMBER, refusing to initialize ldb_wrap open of secrets.ldb rpccli_create_netlogon_creds failed for NT4DOMAIN, unable to create NETLOGON credentials: NT_STATUS_NO_MEMORY Could not open handle to NETLOGON pipe (error: NT_STATUS_NO_MEMORY, attempts: 1) This is again a problem for this particular call, forcing the close of this connection The connection to netlogon failed, retrying set_dc_type_and_flags_connect: DC for domain NT4DOMAIN claimed it was a DC for domain NT4MEMBER, refusing to initialize set_dc_type_and_flags_connect: DC for domain NT4DOMAIN claimed it was a DC for domain NT4MEMBER, refusing to initialize ldb_wrap open of secrets.ldb rpccli_create_netlogon_creds failed for NT4DOMAIN, unable to create NETLOGON credentials: NT_STATUS_NO_MEMORY Could not open handle to NETLOGON pipe (error: NT_STATUS_NO_MEMORY, attempts: 2) This is again a problem for this particular call, forcing the close of this connection This is the third problem for this particular call, adding DC to the negative cache list: NT4DOMAIN (null) The connection to netlogon failed, retrying set_dc_type_and_flags_connect: DC for domain NT4DOMAIN claimed it was a DC for domain NT4MEMBER, refusing to initialize set_dc_type_and_flags_connect: DC for domain NT4DOMAIN claimed it was a DC for domain NT4MEMBER, refusing to initialize ldb_wrap open of secrets.ldb rpccli_create_netlogon_creds failed for NT4DOMAIN, unable to create NETLOGON credentials: NT_STATUS_NO_MEMORY Could not open handle to NETLOGON pipe (error: NT_STATUS_NO_MEMORY, attempts: 3) This is again a problem for this particular call, forcing the close of this connection This is the third problem for this particular call, adding DC to the negative cache list: NT4DOMAIN (null) NTLM CRAP authentication for user [NT4DOMAIN]\[user1] returned NT_STATUS_NO_MEMORY # smbclient //NT4MEMBER/share1 -U NT4MEMBER\\user1 smbd log: check_ntlm_password: Checking password for unmapped user [NT4MEMBER]\[user1]@[NT4MEMBER] with the new password interface check_ntlm_password: mapped user is: [NT4MEMBER]\[user1]@[NT4MEMBER] init_sam_from_ldap: Entry found for user: user1 auth_check_ntlm_password: sam authentication for user [user1] succeeded Auth: [SMB2,(null)] user [NT4MEMBER]\[user1] at [Wed, 19 Dec 2018 14:00:37.714900 CET] with [NTLMv2] status [NT_STATUS_OK] workstation [NT4MEMBER] remote host [ipv4:X.X.X.X:40494] became [NT4MEMBER]\[user1] [S-1-5-21-x-x-x-21020]. local host [ipv4:X.X.X.X:445] log_no_json: JSON auth logs not available unless compiled with jansson check_ntlm_password: authentication for user [user1] -> [user1] -> [user1] succeeded NTLMSSP Sign/Seal - Initialising with flags: Got NTLMSSP neg_flags=0x62088215 NTLMSSP Sign/Seal - Initialising with flags: Got NTLMSSP neg_flags=0x62088215 init_group_from_ldap: Entry found for group: 544 init_group_from_ldap: Entry found for group: 100000 Adding homes service for user 'user1' using home directory: '/posta/user1' adding home's share [user1] for user 'user1' at '/data/osobni/%S' Allowed connection from X.X.X.X (X.X.X.X) Connect path is '/tmp' for service [IPC$] Initialising default vfs hooks Initialising custom vfs hooks from [/[Default VFS]/] NT4MEMBER (ipv4:X.X.X.X:40494) connect to service IPC$ initially as user user1 (uid=10010, gid=513) (pid 7874) get_referred_path: |share1| in dfs path \NT4MEMBER\share1 is not a dfs root. smbd_smb2_request_error_ex: smbd_smb2_request_error_ex: idx[1] status[NT_STATUS_NOT_FOUND] || at ../source3/smbd/smb2_ioctl.c:312 NT4MEMBER (ipv4:X.X.X.X:40494) closed connection to service IPC$ Allowed connection from X.X.X.X (X.X.X.X) Connect path is '/samba1/664' for service [share1] Initialising default vfs hooks Initialising custom vfs hooks from [/[Default VFS]/] Initialising custom vfs hooks from [recycle] load_module_absolute_path: Module '/usr/lib64/samba/vfs/recycle.so' loaded NT4MEMBER (ipv4:X.X.X.X:40494) connect to service share1 initially as user user1 (uid=10010, gid=513) (pid 7874) winbind log: [ 9238]: request interface version (version = 30) [ 9238]: request location of privileged pipe sids_to_xids sam_sid_to_name sam_sid_to_name sam_sid_to_name StartTLS issued: using a TLS connection smbldap_open_connection: connection opened ldap_connect_system: successful connection to the LDAP server | I can provide more details (config parameters etc.) later if it is necessary. I played with all winbind parameters, idmap config parameters but no success. Can anyone please help me to solve this problem? Please find more logs. wbinfo -i user1 (without prepending domain) should show NT4DOMAIN\user1 not NT4MEMBER\user1. The same should be for wbinfo -i NT4DOMAIN\\user1. |# wbinfo -i user1 NT4MEMBER\user1:*:10010:513::/posta/user1:/bin/false winbindd log: [ 9747]: request interface version (version = 30) [ 9747]: request location of privileged pipe getpwnam user1 sam_name_to_sid name_to_sid: user1 for domain init_sam_from_ldap: Entry found for user: user1 name_to_sid: user1 for domain init_sam_from_ldap: Entry found for user: user1 sam_rids_to_names for NT4MEMBER sam_sid_to_name # wbinfo -i NT4MEMBER\\user1 NT4MEMBER\user1:*:10010:513::/posta/user1:/bin/false winbindd log: [ 9744]: request interface version (version = 30) [ 9744]: request location of privileged pipe getpwnam NT4MEMBER\user1 sam_name_to_sid name_to_sid: NT4MEMBER\user1 for domain NT4MEMBER init_sam_from_ldap: Entry found for user: user1 name_to_sid: NT4MEMBER\user1 for domain NT4MEMBER init_sam_from_ldap: Entry found for user: user1 sam_rids_to_names for NT4MEMBER sam_sid_to_name # wbinfo -i NT4DOMAIN\\user1 Could not get info for user NT4DOMAIN\user1 winbindd log: [ 9746]: request interface version (version = 30) [ 9746]: request location of privileged pipe getpwnam NT4DOMAIN\user1 sam_name_to_sid name_to_sid: NT4DOMAIN\user1 for domain NT4DOMAIN name_to_sid: failed to lookup name: NT_STATUS_NONE_MAPPED name_to_sid: NT4DOMAIN\user1 for domain NT4DOMAIN name_to_sid: failed to lookup name: NT_STATUS_NONE_MAPPED | wbinfo -u should list all users from NT4DOMAIN but list nothing. wbinfo -u --domain="NT4MEMBER" list all users which are from ldap - they are NT4DOMAIN users. |# wbinfo -u winbindd log: [ 9754]: request interface version (version = 30) [ 9754]: request location of privileged pipe [ 9754]: request interface version (version = 30) [ 9754]: request misc info [ 9754]: request netbios name [ 9754]: request domain name [ 9754]: domain_info [NT4DOMAIN] list_users NT4DOMAIN samr: sequence number # wbinfo -u --domain="NT4MEMBER" NT4MEMBER\dovecot NT4MEMBER\root NT4MEMBER\nobody NT4MEMBER\user1 winbindd log: [ 9756]: request interface version (version = 30) [ 9756]: request location of privileged pipe list_users NT4MEMBER samr_query_user_list smbldap_search_paged: base => [ou=Users,dc=intranet,dc=xx], filter => [(&(uid=*)(objectclass=sambaSamAccount))],scope => [2], pagesize => [1000] smbldap_search_paged: search was successful samr: sequence number sam_rids_to_names for NT4MEMBER | Mirek

3 10

CentOS Dojo at FOSDEM, Feb 1st, 2019
by Rich Bowen 02 Jan '19

02 Jan '19

We're looking forward to seeing all of you in Brussels next month! The annual FOSDEM CentOS Dojo will be happening, as usual, on the Friday before FOSDEM starts - February 1st, 2019 - at the Marriott Grand Place, just a few minutes walk from Grand Place. We do ask that you register, so that we can plan for space, budget, and coffee breaks. We are currently about half full, so don't wait! More details, including the full schedule of presentations, and the registration link, are on the event website: https://wiki.centos.org/Events/Dojo/Brussels2019 See you in Brussels! -- Rich Bowen - rbowen(a)redhat.com @CentOSProject // @rbowen 859 351 9166

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