Chapter 9: Replication
Adding a new peer into an existing replication ring
214
Adding a new
peer into an
existing
replication ring
Before you begin, SafeWord must installed and running on the machine you
intend to add into the ring. In this example, peers “A” and “B” are existing, and
you are adding new peer “N” between “A” and “B.”
1
Verify the existing replication ring is in a ‘steady state’ (i.e. state where no
changes need to be replicated) by doing the following:
a
Open a console window and cd to
<Install_Dir>\SERVERS\Database\bin
b
Run the batch file called
tsexec QueryChangeLog.bat
This file queries the change log in the local database. An empty change
log means there are no more changes to be propagated. Do this on at
least “A” and “B” (ideally on all peers in the ring).
c
The system is in a steady state once the output indicates:
Empty set
2
Back up the database on either “A” or “B” (they should be in sync).
3
Stop
the Admin Server and Authentication Engine on “A” and “B” to prevent
any further database changes from being propagated.
Important:
Do NOT stop
the database servers.
Example steps for adding a peer to a replication ring
To add a new peer to an existing (example) replication ring, do the following:
Step 1 of 5: on peer “A”
1
Edit file
<Install_Dir>SERVERS\Shared\sccservers.ini
:
a
Locate line starting with
‘
ReplNext_JDBC_URL
’
b
Replace name or address of
Next
peer on that line (which should have
been “B”) with the name or IP address of “N”.
If the database on “N” was installed on a custom port (other than 5010),
make sure to reflect the correct port in this setting.
c
Save
the file.
2
Open a console window and cd to
<Install_Dir>\SERVERS\Database\bin.
3
Run the batch file
tsexec AddReplPeer.bat N_IP_address
with the
parameter specifying IP address of “N”.
Step 2 of 5: on peer “B”
1
Edit file
<Install_Dir>\SERVERS\Shared\sccservers.ini:
a
In the line starting with
‘
ReplPrev_JDBC_URL
’, r
eplace name or address
of
Previous
peer on that line (“A”) with the name or IP address of “N”.
If the database on “N” was installed on a custom port (other than 5010),
make sure to reflect the correct port in this setting.
b
Save
the file.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
