Build React Native App (4) - Redux, Jest, and NativeBase

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From this blog, typescript feature will be added. There are couple of ways to implement static type checking like; flow from facebook, PropTypes and Typescript. Typescript is well integrated with Visual Studio Code and supports better linter, error messages, and intellisense. Reference site Github Sample Ex4 Currnet version D:\GitRepo\reactnative>npm --version 6.3.0 D:\GitRepo\reactnative>react-native --version react-native-cli: 2.0.1 react-native: n/a - not inside a React Native project directory D:\GitRepo\reactnative>yarn --version 1.9.4 Creating React Native App $ react-native init ex4 If you want to specify the version, add "--version 0.57.3" at the end. Add NativeBase to React Native $ npm install native-base --save ... + native-base@2.8.1 added 71 packages from 42 contributors, removed 50 packages, updated 829 packages and audited 34989 packages in 138.542s found 0 vulnerabilities $ $ yarn yarn install v1.9.4 warning package-lock.json found. You...
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DCOS Troubleshooting

Reference

[DC/OS Troubleshooting 1.9] (https://docs.mesosphere.com/1.9/installing/troubleshooting/) NTP Servers

Useful command

  • SSH to your master node and enter this command to view the logs from boot time: journalctl -u dcos-adminrouter -b
  • SSH to your agent node and enter this command to view the logs from boot time: journalctl -u dcos-mesos-slave -b
  • SSH to your master node and enter this command to view the logs from boot time: journalctl -u dcos-marathon -b

Failed to start Navstar: A distributed systems & network overlay orchestration engine

[dcosadmin@dcostest03 ~]$ service dcos-navstar restart
Redirecting to /bin/systemctl restart  dcos-navstar.service
==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units ===
Authentication is required to manage system services or units.
Authenticating as: dcosadmin
Password:
==== AUTHENTICATION COMPLETE ===
Job for dcos-navstar.service failed because the control process exited with error code. See "systemctl status dcos-navstar.service" and "journalctl -xe" for details.
[dcosadmin@dcostest03 ~]$
[dcosadmin@dcostest03 ~]$ systemctl status dcos-navstar.service
● dcos-navstar.service - Navstar: A distributed systems & network overlay orchestration engine
   Loaded: loaded (/opt/mesosphere/packages/navstar--1128db0234105a64fb4be52f4453cd6aa895ff30/dcos.target.wants/dcos-navstar.service; enabled; vendor preset: disabled)
   Active: activating (auto-restart) (Result: exit-code) since Tue 2017-04-18 10:41:57 MDT; 2s ago
  Process: 13580 ExecStartPre=/opt/mesosphere/bin/check-time (code=exited, status=1/FAILURE)

Apr 18 10:41:57 dcostest03.test.flairpackaging.com check-time[13580]: Time is not synchronized / marked as bad by the kernel.
Apr 18 10:41:57 dcostest03.test.flairpackaging.com systemd[1]: dcos-navstar.service: control process exited, code=exited status=1
Apr 18 10:41:57 dcostest03.test.flairpackaging.com systemd[1]: Failed to start Navstar: A distributed systems & network overlay orchestration engine.
Apr 18 10:41:57 dcostest03.test.flairpackaging.com systemd[1]: Unit dcos-navstar.service entered failed state.
Apr 18 10:41:57 dcostest03.test.flairpackaging.com systemd[1]: dcos-navstar.service failed.
[dcosadmin@dcostest03 ~]$

Result from working node for navstar

[dcosadmin@dcostest02 ~]$ systemctl status dcos-navstar.service
● dcos-navstar.service - Navstar: A distributed systems & network overlay orchestration engine
   Loaded: loaded (/opt/mesosphere/packages/navstar--1128db0234105a64fb4be52f4453cd6aa895ff30/dcos.target.wants/dcos-navstar.service; enabled; vendor preset: disabled)
   Active: active (running) since Mon 2017-04-17 16:54:20 MDT; 17h ago
 Main PID: 35307 (navstar-env)
   Memory: 65.2M
   CGroup: /system.slice/dcos-navstar.service
           ├─35307 /bin/bash /opt/mesosphere/active/navstar/navstar/bin/navstar-env foreground
           ├─35316 /opt/mesosphere/packages/navstar--1128db0234105a64fb4be52f4453cd6aa895ff30/nav...
           ├─35438 erl_child_setup 16384
           ├─35463 inet_gethost 4
           ├─35464 inet_gethost 4
           └─36012 inet_gethost 4

Apr 18 10:42:08 dcostest02.test.flairpackaging.com navstar-env[35307]: [warning] <0.931.0>@lashup...
Apr 18 10:42:13 dcostest02.test.flairpackaging.com navstar-env[35307]: [warning] <0.931.0>@lashup...
Apr 18 10:42:15 dcostest02.test.flairpackaging.com navstar-env[35307]: [warning] <0.931.0>@lashup...
Apr 18 10:42:18 dcostest02.test.flairpackaging.com navstar-env[35307]: [warning] <0.931.0>@lashup...
Apr 18 10:42:23 dcostest02.test.flairpackaging.com navstar-env[35307]: [warning] <0.931.0>@lashup...
Apr 18 10:42:25 dcostest02.test.flairpackaging.com navstar-env[35307]: [warning] <0.931.0>@lashup...
Apr 18 10:42:28 dcostest02.test.flairpackaging.com navstar-env[35307]: [warning] <0.931.0>@lashup...
Apr 18 10:42:33 dcostest02.test.flairpackaging.com navstar-env[35307]: [warning] <0.931.0>@lashup...
Apr 18 10:42:35 dcostest02.test.flairpackaging.com navstar-env[35307]: [warning] <0.931.0>@lashup...
Apr 18 10:42:38 dcostest02.test.flairpackaging.com navstar-env[35307]: [warning] <0.931.0>@lashup...
Hint: Some lines were ellipsized, use -l to show in full.
[dcosadmin@dcostest02 ~]$

When I check ntptime, it returned error message. After restarting the ntpd service, it is working now.

[dcosadmin@dcostest03 ~]$ ntptime
ntp_gettime() returns code 5 (ERROR)
  time dca0c0ba.62c68000  Tue, Apr 18 2017 10:43:38.385, (.385841),
  maximum error 16000000 us, estimated error 16000000 us, TAI offset 0
ntp_adjtime() returns code 5 (ERROR)
  modes 0x0 (),
  offset 0.000 us, frequency 0.000 ppm, interval 1 s,
  maximum error 16000000 us, estimated error 16000000 us,
  status 0x41 (PLL,UNSYNC),
  time constant 7, precision 1.000 us, tolerance 500 ppm,
[dcosadmin@dcostest03 ~]$ sudo service ntpd restart
Redirecting to /bin/systemctl restart  ntpd.service
[dcosadmin@dcostest03 ~]$ ntptime
ntp_gettime() returns code 0 (OK)
  time dca0c0cf.70a2d000  Tue, Apr 18 2017 10:43:59.439, (.439984),
  maximum error 1016 us, estimated error 16 us, TAI offset 0
ntp_adjtime() returns code 0 (OK)
  modes 0x0 (),
  offset 0.000 us, frequency 0.000 ppm, interval 1 s,
  maximum error 1016 us, estimated error 16 us,
  status 0x1 (PLL),
  time constant 7, precision 1.000 us, tolerance 500 ppm,
[dcosadmin@dcostest03 ~]$ systemctl status dcos-navstar.service
● dcos-navstar.service - Navstar: A distributed systems & network overlay orchestration engine
   Loaded: loaded (/opt/mesosphere/packages/navstar--1128db0234105a64fb4be52f4453cd6aa895ff30/dcos.target.wants/dcos-navstar.service; enabled; vendor preset: disabled)
   Active: active (running) since Tue 2017-04-18 10:44:03 MDT; 1s ago
  Process: 13990 ExecStartPre=/usr/bin/env ip link set minuteman up (code=exited, status=0/SUCCESS)
  Process: 13984 ExecStartPre=/usr/bin/env ip link add minuteman type dummy (code=exited, status=0/SUCCESS)
  Process: 13981 ExecStartPre=/usr/bin/env modprobe dummy (code=exited, status=0/SUCCESS)
  Process: 13978 ExecStartPre=/usr/bin/mkdir -p /var/lib/dcos/navstar/lashup (code=exited, status=0/SUCCESS)
  Process: 13975 ExecStartPre=/usr/bin/mkdir -p /var/lib/dcos/navstar/mnesia (code=exited, status=0/SUCCESS)
  Process: 13968 ExecStartPre=/opt/mesosphere/bin/bootstrap dcos-minuteman (code=exited, status=0/SUCCESS)
  Process: 13960 ExecStartPre=/opt/mesosphere/bin/bootstrap dcos-navstar (code=exited, status=0/SUCCESS)
  Process: 13946 ExecStartPre=/opt/mesosphere/bin/setup_iptables.sh (code=exited, status=0/SUCCESS)
  Process: 13941 ExecStartPre=/usr/bin/env modprobe ip_vs_wlc (code=exited, status=0/SUCCESS)
  Process: 13938 ExecStartPre=/bin/ping -c1 ready.spartan (code=exited, status=0/SUCCESS)
  Process: 13936 ExecStartPre=/opt/mesosphere/bin/check-time (code=exited, status=0/SUCCESS)
 Main PID: 13995 (navstar-env)
   Memory: 33.0M
   CGroup: /system.slice/dcos-navstar.service
           ├─13995 /bin/bash /opt/mesosphere/active/navstar/navstar/bin/navstar-env foreground
           ├─14006 /opt/mesosphere/packages/navstar--1128db0234105a64fb4be52f4453cd6aa895ff30/nav...
           └─14128 erl_child_setup 16384

Apr 18 10:44:03 dcostest03.test.flairpackaging.com bootstrap[13960]: [INFO] Zookeeper connection...D
Apr 18 10:44:03 dcostest03.test.flairpackaging.com bootstrap[13960]: [DEBUG] bootstrapping dcos-...r
Apr 18 10:44:03 dcostest03.test.flairpackaging.com bootstrap[13968]: [INFO] Clearing proxy envir...s
Apr 18 10:44:03 dcostest03.test.flairpackaging.com bootstrap[13968]: [INFO] Connecting to zk-3.z...1
Apr 18 10:44:03 dcostest03.test.flairpackaging.com bootstrap[13968]: [INFO] Zookeeper connection...D
Apr 18 10:44:03 dcostest03.test.flairpackaging.com bootstrap[13968]: [DEBUG] bootstrapping dcos-...n
Apr 18 10:44:03 dcostest03.test.flairpackaging.com systemd[1]: Started Navstar: A distributed sy....
Apr 18 10:44:04 dcostest03.test.flairpackaging.com navstar-env[13995]: Exec: /opt/mesosphere/pack...
Apr 18 10:44:04 dcostest03.test.flairpackaging.com navstar-env[13995]: Root: /opt/mesosphere/pack...
Apr 18 10:44:04 dcostest03.test.flairpackaging.com navstar-env[13995]: /opt/mesosphere/packages/n...
Hint: Some lines were ellipsized, use -l to show in full.
[dcosadmin@dcostest03 ~]$

Checking ntp setting

check ntp servers

[dcosadmin@dcotest03 ~]$ sudo vi /etc/ntp.conf
[dcosadmin@dcotest03 ~]$ service ntpd stop
Redirecting to /bin/systemctl stop  ntpd.service
==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units ===
Authentication is required to manage system services or units.
Authenticating as: dcosadmin
Password:
==== AUTHENTICATION COMPLETE ===
[dcosadmin@dcotest03 ~]$
[dcosadmin@dcotest03 ~]$
[dcosadmin@dcotest03 ~]$ ntpq
ntpq>
exit
[dcosadmin@dcotest03 ~]$ service ntpd start
Redirecting to /bin/systemctl start  ntpd.service
==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units ===
Authentication is required to manage system services or units.
Authenticating as: dcosadmin
Password:
==== AUTHENTICATION COMPLETE ===
[dcosadmin@dcotest03 ~]$ ntpq
ntpq> peer
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 itachi.tux-host 193.49.184.17    3 u    -   64    1   47.916   -0.383   0.102
 ns522433.ip-158 18.26.4.105      2 u    2   64    1   57.707    5.409   0.194
 159.203.31.244  23.213.115.25    2 u    1   64    1   51.155   32.976   0.162
 206-248-144-162 .PPS.            1 u    2   64    1   46.510   -1.090   0.000
ntpq> peer
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
+itachi.tux-host 193.49.184.17    3 u    6   64    1   47.863   -0.394   0.076
+ns522433.ip-158 18.26.4.105      2 u    5   64    1   57.427    5.302   0.064
-159.203.31.244  23.213.115.25    2 u    4   64    1   51.155   32.976   0.102
*206-248-144-162 .PPS.            1 u    4   64    1   46.068   -1.099   0.129
ntpq> quit
[dcosadmin@dcotest03 ~]$ service ntpd restart
Redirecting to /bin/systemctl restart  ntpd.service
==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units ===
Authentication is required to manage system services or units.
Authenticating as: dcosadmin
Password:
==== AUTHENTICATION COMPLETE ===
[dcosadmin@dcotest03 ~]$ ntpq
ntpq> peer
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 ca.picquenot.co 193.190.230.66   2 u    1   64    1   47.831    1.169   0.166
 ns522433.ip-158 18.26.4.105      2 u    2   64    1   57.797    5.207   0.045
 ns1.ptpbroadban 132.246.11.227   3 u    1   64    1   47.310   -0.718   0.059
 time.srv.ualber 129.128.153.62   2 u    2   64    1    9.979   -0.672   0.000
ntpq> exit
[dcosadmin@dcotest03 ~]$ exit

Hanging from sudo /opt/mesosphere/bin/./3dt -diag

  1. Check firewall is disabled [dcosadmin@dcostest01 ~]$ sudo systemctl stop firewalld && sudo systemctl disable firewalld

  2. Check log using journalctl -xe Apr 25 13:57:24 dcotest06.test.flairpackaging.com bootstrap[2632]: [WARNING] Connection dropped: socket connection error: Name or service not known Apr 25 13:57:24 dcotest06.test.flairpackaging.com bootstrap[2632]: [INFO] Connecting to zk-3.zk:2181

This is zookeeper error journalctl -u dcos-exhibitor -b

  1. Check detect_ip
[dcosadmin@dcotest03 ~]$ cat /opt/mesosphere/bin/detect_ip
#!/usr/bin/env bash
set -o nounset -o errexit
export PATH=/usr/sbin:/usr/bin:$PATH
echo $(ip addr show ens160 | grep -Eo '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | head -1)
[dcosadmin@dcotest03 ~]$

NTP Error

[dcosadmin@dcotest05 ~]$ ntptime
ntp_gettime() returns code 5 (ERROR)
  time dcaa4b8d.a65aa000  Tue, Apr 25 2017 16:26:21.649, (.649820),
  maximum error 16000000 us, estimated error 16000000 us, TAI offset 0
ntp_adjtime() returns code 5 (ERROR)
  modes 0x0 (),
  offset 0.000 us, frequency 0.000 ppm, interval 1 s,
  maximum error 16000000 us, estimated error 16000000 us,
  status 0x40 (UNSYNC),
  time constant 2, precision 1.000 us, tolerance 500 ppm,
[dcosadmin@dcotest05 ~]$ service ntpd restart

The best way is to change server list from /etc/ntp.conf to the reference document In most cases it's best to use pool.ntp.org to find an NTP server (or 0.pool.ntp.org, 1.pool.ntp.org, etc if you need multiple server names). The system will try finding the closest available servers for you. If you distribute software or equipment that uses NTP

[dcosadmin@dcotest05 ~]$ cat /etc/ntp.conf
......
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
server 0.pool.ntp.org iburst
server 1.pool.ntp.org iburst
server 2.pool.ntp.org iburst
server 3.pool.ntp.org iburst

If ntp time is still issue, please run below command. This will change NTP enabled value from No to Yes.

[dcosadmin@dcotest05 ~]$ timedatectl set-ntp true
[dcosadmin@dcotest05 ~]$ timedatectl
      Local time: Wed 2017-04-26 10:51:46 MDT
  Universal time: Wed 2017-04-26 16:51:46 UTC
        RTC time: Wed 2017-04-26 16:51:45
       Time zone: America/Edmonton (MDT, -0600)
     NTP enabled: yes
NTP synchronized: yes
 RTC in local TZ: no
      DST active: yes
 Last DST change: DST began at
                  Sun 2017-03-12 01:59:59 MST
                  Sun 2017-03-12 03:00:00 MDT
 Next DST change: DST ends (the clock jumps one hour backwards) at
                  Sun 2017-11-05 01:59:59 MDT
                  Sun 2017-11-05 01:00:00 MST
[dcosadmin@dcotest05 ~]$

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